You have completely missed the point of the article. So you didn't actually read the article and you're making a dumb claim based on a misunderstanding.
That doesn't work very well either. There are countless examples like the anti-vax nonsense.
I'll agree with the statement that deplatforming doesn't work very well. But it could work better than the alternatives in some cases.
Removing 60 Minutes from CBS doesn't stop people like you from on elsewhere.
Instead, it fuel them to post elsewhere.
Deplatforming didn't work, and deplatforming doesn't work now.
Also: this is entirely anglocentric. I don't think you'd find anyone claiming that the Chinese government censorship system backfired or is completely ineffective. It's an even stronger system than billionaires over there.