Ask Lemmygrad

Sanders (a one-time friend of Parenti) voted, post facto, for the bombing by NATO, siting "genocide" as the chief concern at the time. However, one of the major critiques of NATOs actions is that it accelerated ethnic cleansing in the region. An article in The Guardian from 2009 had this to say:

Though justified by apparently humanitarian considerations, Nato's bombing of Serbia succeeded only in escalating the Kosovo crisis into a full-scale humanitarian catastrophe. It is now widely acknowledged that the bulk of the ethnic cleansing and war crimes occurred after the start of Nato's campaign, with an OSCE inquiry highlighting "the patterns of the expulsions and the vast increase in lootings, killings,removed, kidnappings and pillage once the Nato air war began on March 24". Despite regular proclamations about Kosovo's supposed multi-ethnic character and minority rights provisions, the failure to first prevent, and then to facilitate the safe and sustainable return of, over 200,000 internally-displaced persons (IDPs) is testimony both to the shortcomings of the initial justifications for intervention and the international community's now almost decade-long mission to reconstruct Kosovo.

It's also true that some of the targets hit by the NATO bombings were things like, schools and hospitals, and neighborhoods.

Parenti stated at a talk once that Sanders' vote for the bombings is what terminated their friendship.

The write-up you posted looks very detailed, I'll have to give it a read soon. There has been a long history of challenging the "genocide" narrative surrounding NATO's involvement. The claim NATO made at the time just doesn't seem to stand up to scrutiny.