Not really... Hillary's ceiling was only around 43%... It's very unlikely it would swing from 43% to 50%.
People here are just really overestimating Biden's numbers.
Hillary barely invested in TX, how can you say that was her ceiling? In a state like TX registration/turnout operation is crucial.
Clinton actually dumped boatloads of money into TV ads in TX and iirc also invested loads into vote registering and such. It was in fact one of the reasons she did so well there in 2016.
If 43% is what boatloads of cash got Hillary, perhaps my initial goal of 47% was too steep. Biden's ceiling is probably like 45-46%.
I would say that Biden can still win TX, but it'd be a tough climb, and it'd rely on a lot of things going right for him. Realistically his ceiling is around 48-49% I guess, but most likely he gets between 45 and 47 percent, with Trump winning by 2-3 points.