IANAL, but I work for a defense lawyer who handles expungements.

The whole point about expungement is that the court thinks you were guilty but is letting you off anyway because you've filled certain statutory criteria.

The most usual criterion (other than turning 18) is the passage of time.

This isn't justice delayed. The delay is the whole point. The court still thinks he's guilty but is letting him off anyway.

This means he can stop fighting REGARDLESS on whether or not the justice system thinks he was guilty.