It's possible that Thiel knew something deeper about the state of the nation through Palantir. However, I seriously doubt that Palantir secretly worked on the data that Kogan sold to CA years after he collected it, as this Wylie guy alleges. He has presented no evidence, and Palantir flatly denies it. I think he has seen the media run with his previous claims, and thinks that nobody will call BS on him now.
I have started wondering what could be driving this guy to make what at first seemed like believable allegations, that now seem more and more wild. I have been unable to find any current employer for him. My suspicion is that he is out of work and thought the attention from this would get him hired somewhere, not realizing that nobody - even the most liberal of firms - will hire him because he has proven, in the most public of ways, that he can't be trusted to not disclose confidential information.
According to [1], he is a dyslexic high school dropout with ADHD who sued his elementary school because he was bullied and "...he describes himself as the gay Canadian vegan who somehow ended up creating "Steve Bannon's psychological warfare mindf--k tool." That is certainly a grandiose claim, but there seems to be no evidence that this tool even worked, and in fact there is some evidence to the contrary [2]. It appears that campaigns hired CA not because its data analysis techniques were helpful, but because doing so was a prerequisite for obtaining campaign contributions from the Mercer family [3].
So, we have an out of work programmer with social issues who has no degree and can't be trusted, whose most famous work apparently didn't work at all (according to its customers), and whose biggest asset is that the media will take everything he says as fact. My guess is that Wylie's claims will get even more bizarre as he and his stories quickly disappear from the headlines with no work forthcoming.
[1] http://www.cbc.ca/news/canada/british-columbia/christopher-w...
[2] http://www.businessinsider.com/cambridge-analytica-facebook-...
[3] https://twitter.com/kenvogel/status/975756418128187393