that is not true about the bodies at all, every year they bring some back when conditions allow, ,there is also litter there that must be returned like the oxygen bottles and just plain garbage from camping.
https://www.outsideonline.com/2394520/everest-dead-bodies-trash-removalThe thing that piss me of is, most people who go are rich fat fks, so they should sign a clausule that in case of death their removal is paid by them (through their own money or maybe a insurance company)......mountain gods or not, its a shame the place is disrespected by a bunch of egocentrical glory hounds