Balogun is allowed to play because FIFA has suspended his red-card ban, so the punishment is temporarily on hold and he is eligible for the next match.

What happened

He was originally set to miss a game after a straight red card against Bosnia- Herzegovina, but FIFA’s disciplinary committee used a rule that lets them suspend enforcement of the ban.

Why that matters

That means the red card still exists on his record, but the one-match suspension is not being enforced right now. In practical terms, he can play against Belgium in the World Cup round of 16.

Simple version

The easiest way to say it is: FIFA overruled the immediate ban and cleared him for this match.

Forum-style take

“He was banned, but FIFA suspended the ban, so he’s allowed to play now.”

TL;DR: Balogun can play because FIFA suspended his red-card suspension, not because the red card was erased.