Ola Englund figures out how to play the Megadeth song Angry Again by ear in 40 minutes. It's an interesting watch. It's not the most complex song in the world, but there is no way I could do this. I'm not a great pitch matcher, so this would take me all day, and there is no way I could get the solo, which amazingly, he does.
He could fake this, but I don't think he would because, amazing as it is, transcribing by ear is not a unique ability. Thousands of talented kids can do it. It's even more common among session musicians like him.