Was thinking similar watching Mbappe play night. Kane level finishing + superior athleticism.
As a pure number 9, you can argue Kane's not at the very very highest level that you are talking about. But then he has other qualities that most number 9s, including Mbappe, don't have.
Mbappe Defoed that first goal straight at Neurer, who should have saved it. Nothing elite about that. And he misses hell of a lot of good chances. Ndombellendbadboy is just talking shit as usual. These mystical other strikers who never miss simply don't exist. They just watch YouTube highlights of various strikers scoring goals and think they never miss. A lot of self appointed experts also base their opinions on how a player peforms in FIFA.