Connecting "Leftism" to dictatorships, when the majority have been pretty objectively right-wing in nature, is a ridiculous statement. There is absolutely nothing about left-wing views which in any way lead towards dictatorship.
Worse, the very concept of individual human rights is itself a left-wing concept, originating in socialist theory.
This is trivially disproven by the many nations with objective definitions of "hate speech" under their laws."Hate speech" also doesn't exist, because it is entirely subjective what constitutes "hate" or not, therefore the only logical way of banning "hate speech" is to ban "speech" period.
"Hate speech" is as "subjective" a term as "murder" or "rape".
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More specifically, free speech as a right only covers the government censoring you.
Your employer can fire you for your speech.
Any organization you're a member of can ban you for your speech.
People you know can disavow and shun you for your speech.
And so on.
Freedom of speech provides absolutely zero immunity to social consequences. Because everyone else has freedoms, too.
Plus, it's a little off-topic, since nothing about what happened at Blizzard is in any way protected under freedom of speech.