That's not censorship though. Threats are what people are forced to do when they cannot censor you, as censorship is much more direct. And DDoS attacks aren't speech.
You've seemingly distinguished DDoS attacks from legitimate traffic. If someone is "flooding the zone" with disinformation with the purpose of making it impossible to discern the truth (i.e. it's not legitimate, good faith discourse), is it not reasonable to draw a parallel with DDoSing?
DDoS traffic doesn't contain any form of "speech" and cannot lead to any. If you insist on drawing dodgy analogies, the correct parallel would be someone taking a truck to a political rally and then playing incredibly loud white noise at volumes that prevent people hearing each other.
As for the idea that people are deliberately flooding the zone with disinformation, I'm afraid I've only seen that coming from the sort of people who use it as an excuse to engage in censorship. There is certainly a massive disinformation problem, but it's not the one they mean when they say that. Consider the experience of this guy, who just "woke up" to the fact that the BBC has been manipulating him:
I myself watched a deceptive BBC news report last year in which they presented a social worker as a "dental specialist", a man whose brother died of COVID except the report admitted the cause of death was unconfirmed, and supposedly flooded ECMO unit that turned out to have spare beds available.
