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He plays comically tight, AND he does not buy in full. I believe he buys in for 65bb or so
I think that being tight and being short stacked go hand in hand. You can't really speculate too much, because your short stack means you won't have great implied odds if you do hit an oddball hand (think tom dwan), and strong hands and a tight style generally have the biggest advantage before the flop and on the flop. By the turn and the river there is more potential for your opponent to have caught up and punish you with large river bets or bluffs. Not only is the pot size much larger on the turn and river, meaning wrong decisions cost much more, but equity tends to be more dramatically in favour of one player or the other (by the river it is generally 100/0 unless of course you are tied, but even by the turn you are more likely for one player to be a huge favourite). Tight players are forced to play defensively at this point, often check deciding or checking back, as their hands are a lot more face up than their opponents. Essentially, loose players have the advantage on the turn and river, because of their wide ranges. Tight players have the advantage before the flop and on the flop, because of the raw strength of their hands. So by short stacking you can make hold'em a preflop / flop game, essentially robbing loose players of their natural late street advantage.