Floods again

I have just purchased for the Gaia Library William Ryan and Walter
Pitman's book "Noah's Flood: The New Scientific Discoveries about the
Event that Changed History".

It proposes (implicitly) that the Black Sea lake circa 5,600 BCE was
the Nostratic homeland, with everyone from the Egyptian Dynastic Race,
Semites, Karvellians, Indo-Europeans and Linear Bander Keramik (Battle
Axe) and Vinca peoples coming out of the Black Sea as survivors.

Whilst I tend to agree with the oceanography and geology, I am having
trouble with the linguistics and archaeology of their proposed
hypothesis. What do you others think?

Regards

John