No, not factual at all. It's only opinion. We do not have fossil evidence for either and we can't even make the claim of what they're factually LIKE. We can only guess what it is or what it's like- because we don't really know. Those guesses do not translate into facts.
We do not know anything about real Bigfoot anatomy. You're only assuming by the descriptions that it's some kind of great ape or relation.
People have reported that Aliens look like humans and have made hybrid offspring with humans. According to their descriptions they could also claim a connection to the fossil record, being LIKE humans. There's nothing factual about any of that either.
You could scoff at the Alien field all you like, but it's full of real people claiming they have real evidence just like we see here.
If you think connecting the dots from Bigfoot or Yeti or any cryptid hominid to the fossil record of extinct hominids is on PAR with claiming fossil evidence of Alien hybrids?
I cannot help you, this is silly.
When you have proof of Aliens at some point in Earth's history? Like we do with upright bipedal homonids?
Get back to us!