In general, Thiel's political opinions are hardly a secret; you can read his own words at https://www.cato-unbound.org/2009/04/13/peter-thiel/educatio...:

"I no longer believe that freedom and democracy are compatible"

This is literally the primary thesis of Hoppe's book.

And note that Hoppe's isn't saying that promoting homosexuality should get one expelled from society, but rather from communities with "covenants" that restrict it. This arrangement is all about one-dollar-one-vote, so rich people needn't worry - they can live however they want, even establishing their own "covenant" if need be.

That explanation is much more reasonable. If people can choose which covenant to belong to, that's better then some larger collective (like a federal government) imposing it's morals on smaller groups.