The title is a bit clickbaity. He wasn’t stopped from boarding, he had to go through additional security checks. He claims he was told he had to go through the checks because his name was Mohammad… although that’s just him saying that.

I live in UK and I’d say around 50% of the flights I’ve taken to/from US I’ve been pulled aside for extra checks. Many times both on the way out and way back for a 100% check rate on that single trip.

If they did actually say it was due to his name being Mohammad then yeah that’s really bad, but this sounds like they’re making something of nothing. And at no point was he stopped from boarding.