Very interesting. But at this point, it's hard to drill down to factual information, as the article suggests. It appears likely that the Nepal Government is downplaying the problem to protect tourism. Also, the sensationalist article so heavily conflates the situation in India and Nepal overall with EBC that it's hard to keep track from one sentence to the next what they are talking about. And, in the mountain environment, with all kinds of respiratory symptoms being common and a lack of testing, it's probable that no one, even expedition doctors on site, actually knows what's really going on.
After some time, maybe better information will come out.