Hand played by a NL "forum expert" that made no sense to me

[James282]

MP1 is a well known and respected poster in the NL forum. He also talks a decent amount of trash and plays pretty aggro which is why this hand surprised me. MP1 starts this hand with 2491 and SB has 2020. Converter is all [censored] up, so I had to add in any action where money was put in the pot for some reason.

Party Poker (10 handed) converter

Preflop: Hero is BB with J[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">5 folds</font>, UTG calls, MP1 calls, CO calls, SB completes, Hero checks.

Flop: 7[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB bets 100, Hero folds, UTG folds, MP1 calls, CO folds.

Turn: 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>

SB bets 325, MP1 calls.

River: 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>

SB bets 525, MP1 calls.

Final Pot: $1997 won by MP1, a 2+2er with 555!? SB shows a befuddled 95s and loses to this strangely played bottom set. Am I wrong or is this just absolutely brutal?