I think this point is very hard to argue against. Natural selection has no intent, mutation is random and its consequences are thus flukes as to whether they work or not to support an organisms survival. Very well explained @_nothing!
Their post missed the fact that evolution is about selection, not just single mutations.
No it doesn't. You're just assuming such.
They described a scenario where someone was born with mutated hands that happened to be useful for swimming after the earth floods. There’s no selection or evolution there.