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.
Did she? I don't recall Clinton investing in voter registration in TX and the DNC definitely wasn't there. She only ran one week of ads touting her Dallas Morning News endorsement in October 2016. Hardly enough to move hundreds of thousands of votes.