SNG Wiz Says this ok but don't understad?

[wbmustang]

PokerStars Tournament, Big Blind is t150 (4 handed) Converter on pregopoker.com

CO (t7414)
Button (t4085)
Hero (t865)
BB (t1136)

Preflop: Hero is in SB with 6[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/club.gif[/img]
<font color="gray">CO folds</font>, <font color="gray">Button folds</font>, <font color="red">Hero raises to t865 </font>,

SNGwiz says that this is a push but I am trying to understand the reason. I feel like SNG is having push a lot more hands that I normally wouldn't but I think overall it is helping my ICM game. I am not mad about the result which is I lost because the BB had 77. But I just want to understand the reason why this push is good. I know that ICM is overall not perfect but just confused I guess. Please help me bring light to this situation.