It's true that PoS isn't secure enough for an immutable ledger (think about why you don't reuse addresses and why cold storage works the way it does if you're not following). However, it's also true that Craig says things that don't make any sense at all regarding scalability! He might actually be ignorant enough to believe what he's saying, but my guess is, he's just a fraudster.
BSV has no trustless scaling solution I've ever heard of, and I've spent more time listening to CW than I care to admit. As far as I can tell, I'm not making any incorrect assumptions! Feel free to educate me if I'm missing something. Lightning Network isn't a scaling solution either if you actually understand it, but at least it does have some use cases!