While some of the execs have met in person now, the whole thing was bootstrapped by a handful of people before they met.

He's claiming that, but that's not all he's claiming. His claim about remote work being a big mistake for the tech industry is much broader than just early stage startups. But as far as I can tell, he has no real basis for his claim except for early stage startups; so his claim could be true for them but false for the tech industry as a whole.

There are plenty of companies working fully remote of different sizes ranging from a duo to a trio of three up to few hundred.

The claim is as absurd as startups not having mechanical keyboards or not using JIRA fail miserably to capture market.