The most charitable interpretation I can give is that he's so terminally anticapitalist, that he's also gone anti-pharma brained, on the assumption that, since Pfizer et al are dirty private capital companies, their products must naturally not work, and they've only been rushed into production and approval by way of corporate-government collusion to enrich these companies. Unfortunately, this falls flat on its face when the vaccines do, in fact, work. Pfizer has made billions off the backs of people panicking from covid, but this was only due to government collusion, Bill Gates (the guy who invented going on the computer) declaring himself vaccine czar and taking charge of who gets to be jabbed and who doesn't, and unwilligness by every single western government to free the Pfizer vaccine from patent restrictions so other countries could make their own instead of waiting and dying while Bill Gates decides to apportion some more vaccines. The fault here is not of the vaccine in and of itself, but of capitalist neoliberal governments doing what they do best.