That page seems like it used a lot of fancy language to say something that could be said in two sentences.
> By sending an email that repels all but the most gullible the scammer gets the most promising marks to self-select, and tilts the true to false positive ratio in his favor.
I mean the people who take the time to troll the scammer back want enjoyment out of it, and the chance of getting that enjoyment would seem to be heightened if the scammer seems more likely to be an idiot.
I did get an IRS scam VOIP number shutdown last week in about 15 minutes.