I remember Romelu Lukaku being a great striker too until he moved to Chelsea.... After that his performance got worse... Even now that he's playing at Inter, he can't get back to his best past results... It could also happen to Kane if he changes teams and leagues... I guess it's all about habit and age... If you're not young, it's harder for you to change your familiar surroundings...
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Over time, Lukaku's performance has decreased because in my view, it seems that Lukaku has an unproportionate weight or physique to become a professional player. Therefore, at least it's not surprising that Lukaku's performance continues to suffer, but about Kane I think it's a different factor. So, because Kane can still maintain a professional body shape, I'm sure Kane still has a good chance if he plays at Bayern Munich. After all, it's not right if you are pessimistic about Kane, who will not necessarily experience the same bad things as what happened to Lukaku.