This looks like a lot of elitists trying to grab some notoriety for their niche projects. Inappropriate criticism by people who (quite obviously) want some credit for their time spent, rather bash a casual observer in lieu of that. His crime is putting together a contextual narrative based on some existing deductions. It's a health book - "sleuths that had already reached that conclusion".

There was nothing spectacular about that article, other than he said it was settled and that doesn't sit well with people looking for greater meaning and glory. Then the "can't prove an index just because pages are missing" is basically ignoring a coherent narrative for no purpose. Even the objection to the interpretations - "Personally I object to his interpretation of abbreviations." is strangely contrarian. As you might imagine, the Voynich solution looks reasonable to me, but that's probably because I'm an ignorant layman with no stake in it.