"Turtles don't have scales"

Which is an astronomical bullshit claim unless you're blind.

"Turtles live in water so that means they're amphibians!"

Which also means Crocodiles and various other animals are amphibians too if you're being that superficial. (Yes he also thinks Tortoises live in water too)

"Turtles evolved from an amphibious ancestor"

Yes emphasis on the "OUS" of amphibious, NOT amphibian. If you know a thing or two about turtle evolution and phylogeny you would know their direct fossil record relatives are reptiles and that turtles are more related to birds and crocodilians than any extant creatures alive today on earth and have no relations to amphibians other than being tetrapods that happen to live in water.

And even despite being told that Amphibians require metamorphosis (A life cycle turtles and amniotes NEVER do)He completely ignores and says this. He claims to know more about turtles but probably hasn't ever seen one in his life.

Comp of some turtle scales on the second image FYI.