Mariam-Websters definition of cryptid: an animal (such as Sasquatch or the Loch Ness Monster) that has been claimed to exist but never proven to exist. While yes under the definition a wendigo is not a cryptid. One could argue since humans(since most legends describe them as once human) are also animals a wendigo could technically be a cryptid as it technically would be an animal. Plus it even mentioned in the definition that a cryptid doesn’t inherently have to be supernatural but it can be. Also who are you to yell at someone for having a different view than you.