Doesn't all that seem like some excessive extrapolation? I don't see how you could deduce bipedalism from a jawbone, as far as I know you would need a pelvis for that. I also don't think you could work out intelligence from the jawbone either, when Homo floresiensis made tools despite having a small brain.
What's your point? Fossils of giant sloths have been known for at least 200 years. Thomas Jefferson even told Lewis and Clark to keep an eye out for them. That doesn't mean they are still alive.