There is no theoretical reason I've seen Fake News should only apply to politics. People here aren't critical.

This story will be a mix of machine translations and bad sources.

But there might be a interesting story if you can track it back. It's roughly possible.

https://en.m.wikipedia.org/wiki/Active_Denial_System

One respect in which it seems prima facie that the story is farfetched nonsense but isn’t is provenance. Lianhe Zaobao is owned by the Singaporean government and is reasonably reputable, and the translation is accurate. It is however a report mostly based on a previous report that Jin Canrong, Deputy Dean of IR at Renmin University, claimed that such microwave weapons were used, so evidentially this is not enormously helpful.

There are obviously questions about why they would use such weapons and escalate matters, whether such a weapon could even be constructed to be used at such a distance, etc.

It does seem a little suspect that "The Indian troops on the mountain began to vomit and couldn’t stand and eventually had to leave". They didn't shoot back sometime before "eventually"? Surely they at least had a mortar tube or something up there.

Then again, maybe they have incredibly restrictive ROEs.

Microwave weapons are not far fetched, only there are no details given about how someone concluded that they were used in this instance. Did someone detect the microwaves and find the direction of the source?