This is not meant to hijack the thread but I do not believe the court would agree with either of your positions.
The 2009 Florida Statutes
Title VI
CIVIL PRACTICE AND PROCEDURE
Chapter 83
LANDLORD AND TENANT
View Entire Chapter
83.49 Deposit money or advance rent; duty of landlord and tenant.--
(1) Whenever money is deposited or advanced by a tenant on a rental agreement as security for performance of the rental agreement or as advance rent for other than the next immediate rental period, the landlord or the landlord's agent shall either:
(a) Hold the total amount of such money in a separate non-interest-bearing account in a Florida banking institution for the benefit of the tenant or tenants. The landlord shall not commingle such moneys with any other funds of the landlord or hypothecate, pledge, or in any other way make use of such moneys until such moneys are actually due the landlord;
(b) Hold the total amount of such money in a separate interest-bearing account in a Florida banking institution for the benefit of the tenant or tenants, in which case the tenant shall receive and collect interest in an amount of at least 75 percent of the annualized average interest rate payable on such account or interest at the rate of 5 percent per year, simple interest, whichever the landlord elects. The landlord shall not commingle such moneys with any other funds of the landlord or hypothecate, pledge, or in any other way make use of such moneys until such moneys are actually due the landlord; or
(c) Post a surety bond, executed by the landlord as principal and a surety company authorized and licensed to do business in the state as surety, with the clerk of the circuit court in the county in which the dwelling unit is located in the total amount of the security deposits and advance rent he or she holds on behalf of the tenants or $50,000, whichever is less. The bond shall be conditioned upon the faithful compliance of the landlord with the provisions of this section and shall run to the Governor for the benefit of any tenant injured by the landlord's violation of the provisions of this section. In addition to posting the surety bond, the landlord shall pay to the tenant interest at the rate of 5 percent per year, simple interest. A landlord, or the landlord's agent, engaged in the renting of dwelling units in five or more counties, who holds deposit moneys or advance rent and who is otherwise subject to the provisions of this section, may, in lieu of posting a surety bond in each county, elect to post a surety bond in the form and manner provided in this paragraph with the office of the Secretary of State. The bond shall be in the total amount of the security deposit or advance rent held on behalf of tenants or in the amount of $250,000, whichever is less. The bond shall be conditioned upon the faithful compliance of the landlord with the provisions of this section and shall run to the Governor for the benefit of any tenant injured by the landlord's violation of this section. In addition to posting a surety bond, the landlord shall pay to the tenant interest on the security deposit or advance rent held on behalf of that tenant at the rate of 5 percent per year simple interest.
The above is the description of the handling of security deposits. In both clause a and b, it clearly states that in the instance of non-interest bearing or interest bearing, no co-mingling or pledging of security deposits may occur.
The clause you quoted is part of the following regarding notification of where the security deposit is held during the term of the lease, and does not negate the clauses of section 1. The only reasonable explanation would have to do with clause (c) above, the posting of a surety bond rather than the isolated funds.
2) The landlord shall, within 30 days of receipt of advance rent or a security deposit, notify the tenant in writing of the manner in which the landlord is holding the advance rent or security deposit and the rate of interest, if any, which the tenant is to receive and the time of interest payments to the tenant. Such written notice shall:
(a) Be given in person or by mail to the tenant.
(b) State the name and address of the depository where the advance rent or security deposit is being held, whether the advance rent or security deposit is being held in a separate account for the benefit of the tenant or is commingled with other funds of the landlord, and, if commingled, whether such funds are deposited in an interest-bearing account in a Florida banking institution.
(c) Include a copy of the provisions of subsection (3).