[sudosysgen]

It is a conspiracy theory because the CIA spent 20 years trying to find any effects on health and failed, because medical research spent 50 years trying to find a way how non-heating, non-ionizing radiation could have ill effects on health, and because RF fields to power passive spy devices has been demonstrated many times. Anyone believing at this point that a microwave signal weaker than the leakage of a microwave oven was design to hurt people at the embassy is at the level of a conspiracy theory.

There is no scientific basis for the theory, there are decades of research failing to find either a theoretical or empirical basis, while there are other plausible and precedented hypotheses. Every single example you provided however, was immediately technically plausible at the very least. So yes, the theory it was somehow detrimental to the health of the embassy staff is essentially a conspiracy theory. There is nothing behind it beyond motivated reasoning.