I think tool manufacturing could be defined as manually altering an object to make it fulfill a particular purpose in use. We can't even observe Sasquatch wood knocking but we are pretty sure they do it. That would be a very simple stick tool So saying they don't make more sophisticated tools is premature. I'm not saying that Sasquatch build fires and make spears, but in the big picture, I also don't think it will preclude their humanity one way or the other since I feel that being human ( member of genus homo) is a biological condition rather than a behavioral activity or the use of a particular method of procuring food. It might seem more cultural since archaeologists always point to the tools present in the same layers that the bones are found in but they also discover new hominins like Denisovans that might be responsible for some of the tools. Ofcoarse dead specimens don't do anything, so the biological makeup and the anatomy is all that will count.with a voucher specimen.
I would take one hour's worth of observation of one over a dead specimen. I bet I'd learn more about them that way and much quicker. That might seem selfish because because I might not be able to prove much to the world, but I'd know enough before I ever pulled the trigger on one.
That's the way I operate and always will.