@fraying if you read the complaint, no, that's not the root of the issue.
It says #MediaMatters specifically created accounts to follow only inflammatory content and companies, and the complaint also provided evidence that this is extremely rare.
So the root cause wouldn't be that there's a ton of Holocaust denial, but that Media Matters engaged measures to go out and find some, and even then had trouble finding enough to make the sensational story it wanted to tell.