Is it possible that this guy was 100% invisible???
absolutely, it's really not *that* hard if you know what you are doing.
And there's different levels of anonymity - hiding from the general public is easy, while hiding from the NSA might be a lot harder. He only needed to do the former to keep his name unknown, though he probably attempted the latter too.
anyway, OP's post is some kind of nonsense / pure speculation until proven otherwise. The only relevant fact is being a renowned cryptographer. Actually being 38yrs counts as negative evidence to me, since it's so very unlikely Satoshi would have used a pseudonym yet also given his real age.
I admire your scepticism, so please guesstimate the odds of being:
1. a renowned cryptographer capable of developing BTC. According to another renowned cryptographer, S. Haber, there are only 300.
AND
2. being familiar with Bitcoin in its early stages
These are 100% confirmed facts. We can even ignore his age and nationality. Still, I don't think there are more than a handful of persons who fulfill these two criteria. Please tell me where I'm wrong if you disagree.