The author’s point is that Newsom calling Trump a Socialist as an attack on Trump is just Red Scare rhetoric, and it’s ‘unfortunate’ that Trump is not a Socialist, because if he were he’d be pursuing fewer horrible (Capitalist and Authoritarian) policies. The author is not actually lamenting Trump not being a Socialist, he’s disavowing his views.

This is both a silly way to criticize Trump, and a slander against socialism itself.