Not really, we can't. You can still use a framework for the frontend in an MPA website (and you can have an SPA without a framework, although that's rarer), so

Not really, we can't. You can still use a framework for the frontend in an MPA website (and you can have an SPA without a framework, although that's rarer), so the distinction still makes sense. FYI: Tiktok seems to be an SPA with routing and SSR.