Academic tenure is one of the most important foundations of a research university. Effectively getting rid of tenure would be a death sentence for the University of Florida. No serious academic would want to work there if they had options anywhere else. If anything, dragging them in front of a board every 5 years will only increase "ideological orthodoxy" or whatever he wants to call it.
Yeah but the loss of prestige of UF and FSU won't happen overnight, so it's a problem for (and that can be blamed on) DeSantis's successors.
Scott Walker did the same thing :
https://www.politico.com/story/2015/07/scott-walker-college-professor-tenure-120009?_amp=true
Scott Walker did immense damage to the once-great University of Wisconsin. Invoking him weakens your point.
