Right, this footage is what the people of that page FBFB staked their reputations on. They did not look at all the physiological differences between Sasquatch and the man in the costume here. Height, arms, head/face, legs and other basics such as this not being the type of cheap costume Bigfoot wears. :-)
If I were FBFB then, yes, I'd close my page, too out of sheer and utter embarrassment. I have no idea why they would scream "Authentic!" after watching this -from someone known to hoax?
So, that is why.