Actually, no, the Tau aren't really soviet-inspired. The meme about them being communists is just wrong for a dozen reasons, but more importantly there just isn't really anything there to support the read besides the western brainworm of reading a semi-collectivist phrase like 'the greater good' and their heavy asian coding combining into 'oh these are evil commies' by people with more red scare in their brain than actual political analysis.

If you look at what Tau actually are there's a more compelling, actually intended (per writer statements) reading of them as NATO in their original release (original Tau were primarily characterised by their expansionism, auxilliaries, modern military tactics, and the greater good mantra. Of these only the last one is used to support the commie reading, but if you take all four together it places them as an imperialist power who are constantly expanding and pulling minor powers into their fold using the false consciousness of a greater good for all only to uphold Tau hegemony. This is also part of why the initial release emphasised the kroot/tau relations so much. Once you add the modern military aspect the association of all these traits isn't communists, but NATO. Remember warhammer is a wargame first, the actual military character of a faction is the primary part of it and is usually the part that makes the intended satire clearest) This gradually shifted over time into them being characterised by being orwellian bureaucrats when their lore focused more on Tau proper, which you could argue is 1980s soviets, but it's also just... Fascists. Orwellianisms are too vague of a satire to really be placed as a singular nation and time, obviously Orwell's works are anti-communist and so are modern Tau stories, but they're not really as explicit or vicious as the other satires in 40k. And the entire anti-communist aspect just falls flat hard.

Now if you want to talk about explicitly anti- communist satires in Warhammer the Genestealer Cults are right there being basically 1 to 1 Cultural Bolshevism conspiracies except literally true, even down to the communist revolution aesthetics.

AdMech and Tau are cool though, AdMech aesthetics are great and the inherent silliness of their lore is fun. And Tau can look utterly gorgeous with the right scheme and skills.

Fun! Drycha is very funny, yes. I'd highly recommend messing around with Spearhead when you buy the box, it's not quite as fun as the full game but it's way better than 10e's combat patrol for having small games. And it makes AoS almost affordable.