If you see an Englishman in a kilt, it’s ok to say he’s no true Scotsman. See, “no true Scotsman” is only a problem if person/movement A IS actually fulfulling the functions of role B. And if you can read Marx and find a government that consistently tried to follow his writings, I’ll be very impressed and concede the point. (Though then we can talk about the difference between Marxism and other forms of socialism.)