lmao no it hasn't. It originally referred specifically to people that supported the USSR putting down the Hungarian anti-communist protests. By the time "tankie" became a word (that only really ever had relevance in the UK) Stalin was long dead.
Dictatorship of the proletariat as Marx wrote has never been achieved and arguably(Depending on how naive you believe Lenin was) has never even been worked towards. MLs bastardization of that in the form of a vanguard party is just a different dictatorship of the bourgeoisie as it creates a ruling class.