From here: https://www.sciencenews.org/article/...ropean-farmers

Migrations of some Maykop into Yamnaya territory, accompanied by the transfer of knowledge and language, still happened, Wang’s team suspects. Occasional migrations north through the Caucasus to Yamnaya grasslands fits a scenario in which the ancient homeland of Indo-European language lay among Anatolian farmers, the researchers speculate. If they’re right, they have resolved one of the thorniest issues in the study of languages. But the long-debated origins of Indo-European tongues remain uncertain.
Anybody else as confused as I am? I thought there were only two remaining camps - the Southern origin associated with the source of Steppe CHG and the indigenous Northern Steppe origin. But now, it looks like Max Planck is seriously proposing an origin with farmers.