Andreessen's mention of "indulging in abstract theories, luxury beliefs" is a reference to Rob Henderson's 2019 column in the New York Post, https://nypost.com/2019/08/17/luxury-beliefs-are-the-latest-... which boils down to accusing wealthy liberals of hypocrisy by believing anything progressive but not personally engaging in behaviors they laud. That's more or less a fancy version of Matt Bors' "Gotcha Man" saying "and yet you participate in society". https://thenib.com/mister-gotcha/