> How did you get to normative judgements from a positive assertion?
The description of things a logically incompatible (“oxymoron”) means that support for one logically excludes support for the others. Thiel's description of capitalist democracy as oxymoronic in the presence of women voting excludes support for the combination.
(Though his other statements outside of the one in question suggests democracy, not women's suffrage within it, is the piece he has come to oppose in light of perceiving the incompatibility.)