He's nowhere as good as Lewa, but then there's not many good strikers going at the moment..
That's just seems like a massive retcon after seeing their two
teams go head to head. Kane didn't get a clear chance all game[1] and strikers don't ship 7 goals. If Kane was playing for Bayern in that game, he would've scored more too. Those Lewa shots into the bottom corner are Kane's bread and butter.
I don't see a problem with the opinion that Lewa is better than Kane. I consider them both top 3 strikers alongside Aguero. But to claim that there's a big difference is just silly to me, particularly when one plays for a club in mid-table crisis mode and the other plays for a juggernaut that guarantees massive opportunities and tallies. No vaguely authoritative source would agree with your claim: e.g. Ballon D'Or/FIFA rankings (Kane in the top ten finalists for the third year running), EA's FIFA player ratings (both on 89, top ten forwards), FIFPro (WIX 2), FPA etc.
I prefer to let the individual stats and achievements speak for themselves. You don't score 16 goals in 21 CL matches in an unremarkable team without having something special. Only two people have ever reached 15 CL goals in fewer games than Kane and they both beat him to that milestone by a single game. And neither of them was Lewa (or Aguero, for that matter).
People now call the "one season wonder" jokes trite but underneath it all, for some of them at least, seems to be an ongoing kernel of unironic truth - - a layer of perpetual doubt surrounding Kane that other players just aren't subjected to and that I'm not sure will disappear entirely until after he retires.
If Kane makes the right decisions and things go the way they should, I fully expect his individual stats to reflect a career on par with Lewa's by the time they've both hung up their boots.
[1] Partly because of his deeper role leaving him in a playmaking position behind one or two others (including Son who really should've done better) and mostly because of Son's new selfishness. Kane should've had at least one when Son chose to shoot from a <30° angle instead of making a 4 yard square pass. Son is Spurs'
de facto striker in terms of current positions and roles, yet he has less than half of Kane's tally for the season and should really be catching a lot more flak than he is. Or to put it another way: if Son hadn't scored from one of his five or six shots last night, he'd be getting torn apart by the fans right now.