You’re right, that was an illogical argument. However, it’s important to recognise that the Land Registry as it exists isn’t just a public copy of the data (useful for research, public policy etc.) - it’s the single source of truth about land ownership. Once your land is registered, ownership disputes operate differently, whether you’re holding the deeds or not.

And I am not a lawyer btw so take all this with a pinch of salt :)