The first point seems to directly contradict this (along with the explanation given in its footnote (omitted)) from your first reference:

Once in a while we get a monk in a fit of pique or dudgeon decide to punish another monk or just vent their feelings by systematically down-voting every node by that monk. This is not something that we feel we can outright ban, for several reasons.

Why is what once was innocuous now a firing suspending offense?

Also that would raise the question of what's "Massive" downvoting? There's some persistent neens (of whom it shouldn't be necessary to name the various and sun-dry parties) that pretty much deserve all the derision and downvotes they get. There's also the random white dwarf density questioner that refuses to read what they've been given, persists in trying to bang their head through the wall, and keeps posting terrible code. If one downvotes everything in a thread from such (being frank) a clueless idiot is that "massive", or just an understandable response to the idiocy therein? Or is it only someone (automated, or close enough) going back and willy-nilly dinking everything from said neen indiscriminately?

Second and third points however sound completely reasonable.

Edit: Tl;dr with the explanations given downthread here clarifying "massive" I'm now less disinclined on point one were it similarly clarified.