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Unlikely no, simply impossible, because Yamnaya per se is not the source but the sink of R1b. Harvard has been ridiculous for 5 years linking Yamnaya culture to R1b-L51 / P312 and there are still people who think otherwise. Even anthropologically the riders of the Yamnaya culture were very different - Uraloids, dolichocephals and swarthy, nothing to do with the brachycephalic P312 of the BB culture.
Sredni Stog? At the moment their uniparental markers do not coincide with those of Western Europe, when scientists present convincing evidence then we can believe them, meanwhile the theory of steppe invasions are only fairy tales.
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