Demand is high for affordable housing.

I personally never would, but I would talk to people that have that can give you an idea of what it's actually like instead of getting opinions from everyone who never have and say it's the worst.Jacksonville, FL has been great from 2010-2022, but there has been a huge surge in building residential from 2020-2023, which severely impacted the supply and demand balance and rents have flattened or dropped from 2022-today.

Knocking out improvements over the holidays, and selling beginning of the year when interest rates drop and home prices increase due to demand.

The market is saturated and it's unlikely demand will increase substantially any time soon. 

How is the demand for rentals in those areas?

Jobs will be most in demand as the populations in these states grow.What does this mean for the future of homeownership, rental property investing, home values, insurance, and migration?

I am somewhat familiar with Polk county but I don't believe the rental demand is super high in that area in general. 

WikipediaSustained and significant population growth: Prices and rents are a function of supply and demand.

If they are manipulating the numbers or adding charges that were not fully disclosed and agreed to in the PM Agreement, then I would demand they stop.

They have risen everywhere since then, remaining below historical averages in some cities while surging far above those averages in others.The elevated eviction filings also follow a sharp acceleration in rents, when pent-up demand during the pandemic flooded supply-short housing markets with people looking to rent.