The headline seems a little alarmist; the article in question wasn't "censored" completely, it was just removed from Google. (I'll preemptively disagree with the argument that if a page is not Googleable it doesn't exist.)
Their post was obliterated. Could not be found. Ceased to exist. The DMCA take-down notice removed TechDirt from Google. TechDirt was erased.
All completely true if you don't require modifiers to be stated. I'd prefer that HN doesn't turn into a tabloid.
Whether it's alarmist / excessive is subjective. And, since either would be technically correct, it probably has more to do with implied meanings or the common use of a word, and not the dictionary definition. Their usage of it is certainly defensible, but that has little to do with whether or not a modifier would make it more accurate.
But that leaves a problem: what do you call behavior like this?