If I had to venture a guess (and that's all it is), I'd say that Biden's FDA was feeling its oats after the pandemic and got used to pushing people around.
Add to that, the Obama/Biden administration had a history of finding penalties in businesses and then shaking them down for "fines" that went towards funding their left-wing civil-rights offices in the Executive branch.
They probably got carried away and Abbott wasn't paying to play fast enough.
-PJ
That reason is probably about as good as any and better than most.