Preposterous. Humans are far too stupid to have come up with the triangle on their own. That's as ludicrous as thinking crabs could have evolved naturally. Sideways walking and eyes on stalks? Simple absurdity, they are clearly alien pets of some sort.

And yet...

Edit: The last is my fav because it looks like a snake celebrating that it got arms.

You are totally right, their argument has plenty of holes in it. Just pointing out the dumb "If transoceanic sea travel wasn't possible" they debunked themselves without realizing it.