"The con goes like this: The impersonator lifts an online photo of a Jew, Muslim, African-American or other minority — typically one with clear identifying markers, like a yarmulke-clad Hasid or a woman in hijab. Using that picture as a Twitter avatar, the bigot then adds ethnic and progressive descriptors to the bio: “Jewish,” “Zionist,” “Muslim,” “enemy of the alt-right.”

"False identity forged, the trolls then insert themselves into conversations with high-profile Twitter users — conversations that are often seen by tens of thousands of followers — and proceed to say horrifically racist things...

"Using a crowdsourced database of impersonator accounts, carefully curated by us to avoid any false positives, the bot patrolled Twitter and interjected whenever impostors tried to insinuate themselves into a discussion."

While I see your point about accuracy and don't necessarily buy the "carefully curated" part, I wouldn't describe the described behavior as "spam" either.