You can't report someone for fud like this.
Moderator will have to go trough 2600+ posts in that thread and do very deep research about project and team members before taking any action and even if they take any action after all this, there is possibility that action could be wrong.
There is a reason why this isn't moderated.
I know multi-account is allowed, but here it is clearly abused to spam the thread.
What is it now, FUD or SPAM?