I think the criticism is less "taking a blowtorch to his backside" and more commenting about how, for an article that clearly states its intended audience is "the junior database administrator (DBA) or others with little or no experience in the design, administration, or optimization of database systems", some of the errors in the article may be taken as correct facts.

A lot of these articles are "fire and forget", in terms of people reading them, so someone new to SQL and indexing may well read this, say "OK, I understand now", and never come back to see any revisions, hence what I see as a concern.

Also, when publishing something intended as educational, AND being reviewed by your peers, you WILL get criticism. Take it as constructive, learn from it, and become better.