I see this as an attempt to justify or belittle the organized ethnically/religiously motivated murders of Muslim men in Kosovo, and then when that was stopped by Western nations, somehow being responsible for starting the radicalization of the said Muslim population.
As said, a larger responsibility lies with the salafists.
THe parent comment looks like classic, cheap propaganda to me -- complete with mostly fabricated organ harvesting accusations, similar to the ones often made against Israel. Regarding that "roughly 1,000 missing Serb civilians that were taken by albanian rebels/terrorists and used for organ transplants", the Wikipedia article referred actually says:
> In July 2014, Clint Williamson, the lead prosecutor with the task force, told a press conference in Brussels that unnamed “senior officials of the former Kosovo Liberation Army” will face indictments for crimes against humanity and other abuses. He said there were “compelling indications” that “a few individuals were killed with the intention of extracting their organs” by KLA fighters, but the allegations that hundreds of prisoners were killed and their organs sold was “totally unsupported”.