Does 1% still apply for buy and hold?

[David Harrison]

Just getting started on my property management journey and was hoping to get some clarification.  My goal is to invest in a few rental properties,  and essentially have tenants pay mortgage and repairs. Once I am retirement age these properties would be paid in full and the rent would supplement my retirement.  I see a lot about the 1% rule and I agree with it. However,  is that a pre covid notion? I could see this happening before the balloon but from the prices I see anymore on anything not a slum the cost of the property does not match what it could be rented for.