It's not quite that easy - after all, Obama won there twice.
I suspect his rapprochement with Cuba has hurt them, though it was absolutely the right thing to do and worth the political hit.
In 2020 the real problem was most likely that the Biden campaign did absolutely nothing to compete in Florida, and as usual, abandoned local organisers and get-out-the-vote initiatives until it was far too late. From the New Yorker article:
"In Amandi’s view, the state Party committed “the cardinal sin of electoral politics in Florida with Hispanic voters,” allowing Trump supporters to define it as “the party of socialism and Communism." ”As absurd as it is for Republicans to call Democrats Communists, it’s more absurd for Democrats not to directly rebut that labelling, confront it or refute it, and overcome it.”