Yes, but, and I'm repeating myself, what's funny is that this stat stopped being relevant to you when you found out how other players did. Lukaku scoring x % of his goals against top 6 teams shows that he is shit against top teams, but Salah, Mane or Messi having "worse" stats doesn't mean anything.
Imaigne that I said Ronaldo is clearly the best player ever because he has won five Ballon d'Ors. Then someone point out to me that Messi has won six, and I suddenly decide that the Ballon d'Or isn't the relevant measure and that Ronaldo is the best ever because of some other reason. Clearly it was never about the Ballon d'Or for me, I just wanted to argue that Ronaldo is the best and I'd pick any argument to support it. That's you and Lukaku. The laughable thing isn't that you think he's shit, that's fine, the laughable thing is how you pick, choose and drop arguments as it suits you.