Hello!
The link does work if you copy and past the link starting with http. That sounds like a 'poopy' situation
It does sound pretty similar to the 'microfungus' in the article. It also makes sense that it would be some type of fungus since it is obviously traveling through the air, and fungi form spores which can be airborne.
Now... here is another thought... I'm a total newbie, so I don't know if this is totally stupid... but everyone here seems friendly and forgiving if I make an idiot of myself... so here goes! Is it possible that it is some sort of chemical causing the damage? For example in the watering? What makes me wonder that is that the leaves change colour before the pitting begins, so it almost seems as though it's being damaged from the inside-out. I tried quickly googling chemical damage with orchids, but didn't find anything of interest, so I'm not sure of what would happen if it was being damaged by some sort of chemical... Anyway, again, I apologise if I sound totally stupid, but I am a newbie!
Good luck, and I hope you don't have to throw them all out