Historical examples, like Revolutionary Catalonia for Anarchism, and the USSR, Cuba, Maoist China, Vietnam, etc. for Marxism-Leninism, absolutely count as Socialist and should be learned from, both the good and bad.

If you dismiss them as “not real Socialism,” you fail to learn from what did work in those instances, like literacy rates and life expectancy skyrocketing. If you dismiss the bad, you make the equal mistake of not accounting for the flaws in systems like Soviet Democracy, which resulted in a corrupt Politburo with outsized power.

Study them in detail and find what to take and what to leave behind.