You don't replace players like Harry Kane. You make do with the best you can find, banter can end now as he's not a Tottenham player. Kane is an incredible forward. He's a natural goalscorer, can play deep, can see a pass. They won't replace him, but they also had to either make some money from him or watch him walk next season.
I said before the summer that they needed to cash in early on him and then get Ivan Toney in to do the best job of replacing (or Mitrovic at a push). Neither are as good but both can work the same role to good effect and would cost half what they sold Kane for. If Richarlison is their answer then I honestly don't understand the question.
