You should know that Semitic is part of Afro-Asiatic, right? These two languages are fundamentally on the opposite edge by all means, flora, fauna, linguistic anthropology etc, etc.
There is already some background to this.
en.wikipedia. org/wiki/Indo-Semitic_languages
Its not so hard to imagine because there are also other languages/language groups with links to IE.
en.wikipedia org/wiki/Indo-Uralic_languages
www academia.edu /3803543/Etruscan_as_an_Anatolian_language
And then we have the Caucasian Languages which share Labiovelars with Centum Indo European but not Indo Iranian.
So Indo European seems to have links to many different language families and in some cases (Etruscan) it can be more difficult whether or not classify that language as IE.
The mainstream theory of Indo European genesis on the European Steppe around 4,000BC is completely wrong. This theory just started out as North European bias.
At around the Bronze Age Central Asia is dominated by BMAC. This is what connects Europe, Middle East, India and China via Central Asia. BMAC was Iranian ie Shahname, Avesta, and that is 3,500BC. Rigveda is pre-IVC in India so that would be around 4,000BC.
Now even the Reich Lab is not certain about the Steppe Hypothesis and I suppose with this new Southern Arc thing they are moving away from the Steppe Hypothesis and this is probably just the start of rejecting the mainstream Steppe Hypothesis which really leaves the field open to other ideas and nothing stopping PIE from dating to cirque 10,000BC. But PIE is just the langugae that is the common ancestor of known IE languages. So, we can only go by the languages that are attested and those only start from just before the Iron Age, meaning a lot of diversity of IE languages is already lost ie Anatolian, Tocharian so if we found more diverged IE langauges that existed in ancient times we would have to push IE back further. In recent time more conservative IE languages have expanded from the centre of the tree and older more diverged languages have been lost hence it looks like IE is much younger than it really is.
I dont know what the reich lab is going to publish in this new paper. West Asia did not impact Steppe genetically but culturally. Genetically both West Asian farmers and Steppe coalesce around South Central Asia and to NW South Asians. Because there is a South-East to NW movement within Central Asia, we see more Southern groups in the Pontic Steppe over time, but this is not due to Near Eastern geneflow, it is just that the newer groups appearing in the European Steppe come from further South in Central Asia, hence have less EHG and ANE drift and that brings them closer to Iranians, CHG genetically.
But Nomads and Farmers have existed in IE culture for many thousands of years, though IE coalesces at the nomadic cow-herding society from which most farmers also descend. The Cow, Wheel and Horse all predate farming but we just dont find them because nomads dont leave much trace (unless they build kurgans) so all the dates for nomads, cattle and horses are all messed up in this field.
PIE was the cow-herding stage prior to the Neolithic so it would have existed 10,000BC, but none of the diverged langauges have any descendants today so we cannot reconstruct that time-depth back, todays IE languages are those that expanded and diverged more recently so we get a more shallow time-depth when looking at it.
The Steppe, it was totally dominated in the BA by the BMAC Iranians. There was probably no Civilization ever that had as big an impact as BMAC. It literally coincides with a age of prosperity, migration, trade, development of complex state systems in India, and a huge amount of Iranian linguistic and cultural superstrate in the Germanic languages.