I agree! We need to stop this insane spamming by those two users. They don't have a single idea how bad the situation has become after they started personally targeting the community and those wearing the signature. I am in support of creating a flag against both users.
You cannot stop a user from spamming, all you can do is report a spammers post to the moderator, though i don't think they are going to delete this members post. My suggestion is to completely ignore this member and with time they will stop derailing this topic. I don't creating a flag is appropriate for this, a trust feedback may be a better option.