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Perhaps someone could help me understand what the attack vector of the group suppousedly conducting "DNS error research" is.

No idea, but I wonder if squatting on the most popular misspelt domains, to serve malware/whatever?

e.g. facebool.com or similar, presumably there's an interesting distribution of similar misspellings.

Just a guess but maybe they want to detect domains people are looking up that don't exist so they can squat them.