Hesp's AT jam was terrible for a multitude of reasons.
For starters, when Blumstein checks back an A57 flop MP vs BB, he never has completely air. On a board texture that Blumstein has a range advantage on, he will be cbetting his air 100% of the time and likely giving up if he gets flatted and doesn't turn
equity.
Obviously Hesp isn't thinking deeply about ranges in this spot, however Blumstein's check back range in this spot is going to be something like, weak 1 pair Ax, AA, and JJ-KK. For this reason, Hesp should be leading out on the turn with his hand so it doesn't get checked through.
When Hesp check-raises and Blumstein 3bets on the T turn, Blumstein's range is something like, TT, AA, J9, 98, 86. Blumstein isn't going to be 3betting the flop with one pair in a spot where Hesp is polarized! For this exact reason, Hesp should be calling or possibly even folding the turn when Blumstein 3bets, because Blumstein is polarized and only calls off
hands that beat AT and folds all hands that lose to AT, in his range.
Earlier I also concluded that Blumstein cbets the flop in this spot with all of his air. So, J9, 98, and 86 are very likely not in his range after he takes this line, leaving only AA and AT. So as crazy as this sounds, AT is a fold when Blumstein 3bets the turn.