Spam specifically means (at least originally) so much unwanted traffic that it overwhelms legitimate traffic. So can I see why that commenter might have considered it a contradiction to say "the majority being truthful" as a strategy to deal with spam.
The name comes from a Monty Python sketch where "SPAM!" is being sung so loudly that it drowned out any other conservation.
> Spam specifically means (at least originally) so much unwanted traffic that it overwhelms legitimate traffic.
I guess what today is more commonly known as DOS (or even DDOS sometimes, even if it isn't actually "distributed" per se, for some reason).
I did know about the name since before, but not the original meaning, so cheers for the explanation :)