I am not sure that is correct. Some news reports state that it will affect only a small number, 5 of the 1844.
https://www.abcactionnews.com/news/state/in-depth-understanding-special-districts-in-florida
But, its a bill in progress so maybe it will pretend to apply to all. And I say "pretend" because having worked at the Florida Capitol for a number of years, I know that Florida requires general laws -- that is you cannot fashion a bill in such a way as to seem to be a blanket provision, but draw it up to narrowly target someone. So for example you cannot carve out a tax exemption for all car businesses with a lot of x size, in business since 1973, and with purple in their advertising signs and have that obviously mean to apply to one car business.
Of note per the above, one district not affected by the bill is The Villages. That is about as Republican a stronghold as you can imagine.