What was he incredible at in the first half?
It wasn't "incredible", but it was marvelous, i'd say. People now days use too many superlatives without rhyme or reason just because they sound feelgoody.
However, he was very good, indeed even outside the goal. At tender age he is already able to almost always hold on to the ball and pass in a way that helps the overall flow of the game. He rarely makes rash and dumb decisions and his passing technique is excellent. He also finds the right guy and right trajectory for the pass. He doesn't always try to make key passes like assist to Olmo in previous match or the great pass in the box to Morata (who fucked it up, like always), but when he does, it is with purpose and precision. His overall passing to circulate ball is also quite flawless. He doesn't make teammates run and spin to receive the ball, it's always sharp. He rarely looses it under pressure. His take ons are good, not always successful, but given his age and already good track record of successful dribbles, he'll only get better, when his body matures.
Even in the second goal against France, he participated in the attack with clever disguised right hand side pass to Olmo, that opened space for further attack that ended in Olmos goal. Most players would do the obvious pass to the left flank towards which he was running. There's lot to appreciate in his game besides goals and assists. You seem to not have watched him much. But of course, as per current_thing, the hype is through the roof. Should be toned down a bit, but can't have that on teh internetz.