Nonsense, sounds like post-hoc rationalization. Maybe talk to some actual Slavic people. Sure the Russians had "math clubs" and "chess clubs" but it wasn't as if the US didn't have RadioShack and garage/ham culture. Talk to some of the older generations that still remember the Berlin Wall and you might also understand why so many women from the ex USSR states are in STEM while it's the opposite in the West. TL;dr: STEM was a quick way to prosperity, the eastern bloc countries were poor, and engineers are useful even in a communist regime. They studied math because there wasn't much else they couldn't have done.