I hope that the quote from the report citing mask “thread diameter” is just a misleading choice of words. I wouldn’t think it would be the diameter of the threads that matters, but rather the diameter of the gaps or holes between the threads. Of course, trying to visualize how that would look at the microscopic level, I suppose wider threads would leave wider gaps, kind of like trying to weave together a bunch of logs versus a bunch of toothpicks. Maybe that’s what they meant.
Struck me as questionable also. Are the people who write these important documents just not that smart? Or do they think that we are stupid?