I can't say I agree with that video, as it only seems to muddy the waters to claim that there's all these different obscure interpretations of what tankie means, when the original and core definition is still the most used and accepted one, especially by Anarchists. By his logic, the term 'Anarchist' would've lost all meaning since some right-wing libertarians call themselves Anarcho-Capitalists, which is nonsense.

A tankie refers to someone who glorifies the authoritarian actions of 'socialist' dictators and regimes. It's a simple and agreed upon definition by virtually everyone on the left except by the very people it describes, who dislike the label even when applied accurately.

Bear in mind that Badmouse once considered himself a Marxist-Leninist, and was likely called a tankie at some point despite his efforts to seemingly reform ML circles to stop denying all the bad authoritarian stuff they did historically, so that may influence his stance on the term, and desire to de-fang it somewhat, despite him now turning back to Anarchism more recently after those reformist attempts failed.

Anarchists have used the term Tankie very consistently since its inception, and the definitions have not changed. Anarchists are against Authoritarianism in all forms, and Tankies are by definition for authoritarianism, often pointing to On Authority by Engels to justify the atrocities committed against Anarchists by tankies, such as the massacre of the Kronstadt sailors, as well as the betrayal and executions of Anarchists in the Russian Revolution and the Spanish Civil War.

People who believe violently murdering socialist allies that don't believe in the dictatorship of the proletariat and follow their every order, and who glaze dictatorships, have very much earned the label of Tankie. There is no ambiguity in that sense.