That's why it was important for Brady to not admit any role in the incident today. If he had admitted any role today, public backlash would have put the NFL in no other position than to suspend Brady for the game. His denial buys time for the league to continue their "investigation" without coming to any conclusions on who's responsible until after the game.
Brady's conflicting answers and prior statements, along w his penchant for perfection and attention to detail, it's pretty unlikely that he did not know about the deflated balls, especially if other teams in the league noticed this and they don't touch the ball on every play. He just wants to play in the Super Bowl so badly that he's still in denial mode.
If a guy is willing to cheat with the balls to get to the Super Bowl, why would he all of the sudden come clean a few days later without 100% evidence proving he's guilty, and jeopardize his chance of getting to play in the Super Bowl,
In addition, it's in the NFL and TV Commercials interests that he plays, bc otherwise the Pats will have a rookie QB starting his first game ever on the biggest stage. Viewership would most likely suffer, which is not in their interest.