10+1 MTT: Does Villain have to beat King high straight here?

[levAA]

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how does 3betting to 450 commit us? We're 100 BB deep...

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I did not say you are committed, but you cross the commitment threshold - this is a cash-game concept (and this hand with 100BB deep is quite similar to a cash-game). It's about how your money goes on on later betting rounds with pot sized bets. If you take this hand as an example, you 3-bet to 450 and hit an ace on the flop. If you think you have the best hand (and to answer your second point here - a jack as kicker is trash - so i'm not sure at all that we are ahead preflop or on an ace-high flop) you have to bet. If we make a PSB and get called there is 3000 in the pot on the turn and now you are committed with top pair.