Strikers make runs in and accross. Alternate between pulling the defender short, go in behind.
Wingers make them in behind. Inside or out, they are going for the fullback.
Inside forwards go for the space between fullback and CB - or drop deeper in between the lines to carry the ball and deliver significant passes into the box.
What is he doing? Whenever you see him? Staying wide. Isolating the defender. Good movement of the wingery sort.
He's good on the outside on the left, deliver crosses. Fine on the inside on the right. Poach in in the area. That is still ...a winger?
He still isolates the opponent and tries to beat him. He's not roving horizontally to pick the ball up in pockets in phases of play - which would make him more of an inside forward / number 10.
He's more of a winger than Salah, for me. Salah is capable of playmaking and dropping deep to get possession.
Less of a false nine than most of those who play there for us or Barca, although that is hard to explain. He's just not involved enough with the midfield in those phases. His use of the body against a defender isn't quite the same as the others. He's very biased towards looking to wriggle free on the other side. And then us the ball. And he doesn't do the off the shoulder runs.
He looks quite like Di Maria, but Di Maria was able to operate as midfielder, central even, because of his dynamism. You could play Di Maria as a striker, but he'd need a proper striker, and it was never really worth it. Di Maria needed to be a winger. They try all the time to make someone fit in. Ferguson tried to make Rooney more of a number 9, and it never happened. He just didn't have it. Ended up as always someone who needed a strike partner.
Same here. He's a winger. He can do more, but it's not really worth persevering with when his talent is that obvious - despite him knowing how to finish. That will enhance his game as a winger.
What I want to see from him, is better short passing. That would mean far more than arsing around in the middle trying to be a striker.