Couple of things, first, please provide me the source for the Tatar study, don't just write the numbers down, the other thing is, it's been a known fact that the Tatars living in the old USSR territories have actually intermarried with Russians, so it's not uncommon for them to carry such lineages that resemble Eastern European Russians, as you can see they also have high R1a and N1c which are both high and significant among Russians (That is, assuming your numbers are real and you provide the study).
This map shows one person from Kazakhstan, and by the name of this person, he sounds Russian, I actually have a Russian coworker from Kazakhstan, he confirmed that there are a lot of Russians that live there (At least 30% of the population), and even if this person was not Russian, this map surely shows how weak and insignificant I2a2 is in Central Asia, if anything it proves my point.
As I said before, many question that Nasidze study, in any case, from the link you provided it only shows two Ossetian populations that carry haplogroup I*, notice from the same link that the rest do not carry it? Not to mention the latest most relevant study showed no I at all among them, the other thing is, even if they were carrying I*, how can you prove it was I2a2? Surely it could be I2a1, or I2c, or I2b, you can't simply speculate on facts just because you feel like it, show me a study where they carry I2a2, then we'll talk, until then, you have no good argument.