Given that the act was, as said in the article you cited, never enforced by the government, the deplatforming through ideological purges, 'cancel culture', and media suppression is what actually killed the movement.

So, yes, this actually proves my point. Buring ideas, and canceling the people espousing them does, in fact, kill political movements.

If your goal is to drive a political movement into the fringe, deplatforming works. If your goal is to have an utterly tolerant climate for political movements, regardless of how abhorrent they are, then, well, we're all observing how it's working out right now. Not very well, I must say, but there's always time for things to get worse.