In fact I'll bet the guy who made up that so-called "quote" in 2019 was actually trying to steal Reagan's line, reword it to favor liberals, then try and make it look like Reagan stole it by falsely attributing it to someone 45 years earlier.
I don't claim that as fact, just my educated theory.
And Reagan had reason to make that statement, since fascism came to Germany in the name of liberalism, meaning there's precedent.
And today's "liberals" are acting more like fascists than the alt-right ever has, if only because the alt-right has nowhere near the number of supporters.