In the context of modern history it’s really not. Tankie is meaningless because the states they defend aren’t even the same states that they were when Tankie as a term was coined.

Russia is right wing Christian authoritarian oligarchy. Ran by men who yacht around the French Riviera.

China is a authoritarian mega corporatocracy that sells its shares on Wall Street, and makes iPhones for the biggest American corporation.

Those people on that /c don’t have an ideology, aside from hating the west.