Piotr your expertise needed

Piotr, I'd love to know you're thoughts on the discussion that's
been going on about the suggested Semitic, Berberish, or another Afro-
Asiatic language as a pre-IE substrate in northern and western Europe
and behind Germanic and some of the Celtic languages.

I know you're smart and don't seem to jump to conclusions when
evidence is lacking, but what do you think the evidence that is
available suggests?

-Michael