3 barely DeSantis/Scott seats sounds like a recipe for a dummymander if the Cuban vote ever collapses again, which as noted it did in 2016 and there's no reason it couldn't again. Imagine if Biden's outreach to the Cuban community for the next four years goes well and/or Maduro is ousted.
They're not all barely. The 29th is narrow and would be somewhat competitive depending on what happens with the Cuban vote, but Trump would have won it clearly. The 26th is decisively GOP however and wouldn't be competitive whilst the Scott/DeSantis won the 27th by 9ish so it's not exactly narrow either. The 28th is a Dem vote sink that they'd win by 40+.
28 and 29 sound like Orlando and Tampa area seats based on population. Can't see anything additional coming to Miami.