Well, of course, but that's a pretty big 'if'. I can't say I've read anything really conclusive on the matter. IIRC there are claims of significant pre-Clovis ancestry, especially in South America.
Back to Europe...
For example, it now seems quite possible that the Palaeolithic and Mesolithic languages of Western Europe are irrelevant to what is attested for Western Europe.
That seems to be the majority view... and I don't understand it at all.
To me it's just a bad case of searching for our keys under the streetlight.
We've wiped out pre-Columbian America to an extent that would have been entirely out of reach of the Indo-Europeans. And still the influence of American languages is very noticeable in toponymy, and there are a solid amount of borrowings.
We can debate all day on whether
Tiberis is Etruscan or Italic (and we did!) but at the end of the day I'm afraid what we're doing is debating whether 'Mississipi' is English or Spanish.
On other issues discussed here, positing lost IE languages is good fun, but the best option is probably to leave those poor Pelasgians alone.
There's nothing that surprising with the idea that the Germans and the Greeks borrowed a lot from whomever was there before there, and really no particular reason to claim those earlier people were Indo-European or even related to each other.
I'm also not convinced at all by the idea that a shared material culture necessarily entails linguistic uniformity. It's like claiming the French, Brits and Americans all speak the same language because we use the same Coke bottles.
Mesoamerica at the time of the Spanish conquest is another good example: the area shared a common culture with several unrelated languages. If we just had the ruins of Chichén Itzá and Teotihuacan with no other evidence, I'm not sure we'd have guessed that a different language from a different family was spoken in each place.