Sure, if one of the arguments against it was that there was no civilisation in the world (or fertile crescent and adjacent areas) then yes, that’s not a valid counterpoint.

I was thinking of using the evidence of megastructure building culture in Egypt that there is that matches the, according to the other person, water rising up (if I recall correctly).

It’d be fun and interesting if you’re theory is right. But there’s a lot of burden of proof it needs to overcome. Still, who knows?