I don't think a person saying Eastern European are observed doing something more than expected is inherently racist. It is a claim he either does or doesn't have evidence for.

If he made the claim with insufficient evidence or made the claim in contradiction of the evidence, then it becomes racist, but I don't think making the observation and doing the calculation is the racist part. It is a simple chi-squared goodness-of-fit test.

I’m eastern-ish european, is it even racist to say that tech talent in the region is through the roof but for various accidents of history, the best opportunities available to talented people are in cybercrime (both sides)?

Not everyone has a hundred tech unicorns in their back yard. I think my country (Slovenia) produced one in its entire history so far and even that was mostly in the US