how did the red card get reversed
The red card was reversed because FIFA’s disciplinary committee rescinded the automatic one-game suspension after a review, making Folarin Balogun eligible to play against Belgium.
What changed
The original red card came with an automatic ban, but FIFA later decided to suspend that ban instead of enforcing it. Reports say the decision was unusual and only the second known time FIFA has lifted a World Cup red-card suspension.
Why it happened
Coverage says the reversal followed a review of the incident, and multiple outlets reported that Donald Trump called FIFA’s Gianni Infantino shortly before the decision. FIFA did not give a detailed public explanation beyond the disciplinary ruling.
Practical effect
Balogun was cleared to play in the next match, with the ban replaced by one year of probation for any similar future offense. The U.S. Soccer Federation said it accepted the ruling and was pleased he could compete.
One-line version
In short: FIFA reviewed the red card, nullified the suspension, and then let Balogun play.