That 21 August Tweet is interesting reporting "Gordon" as saying that no-one at Atlanta had ever heard of McEvedy and Beard. I presume that the Gordon is Parish, and that this must have come soon after the Atlanta meeting on 27 April 1987. That seems strange. Shelokov had certainly heard of them, but that was presumably understood and taken for granted. The suspicion is that Holmes had, as he had earlier referred to "an epidemic of diagnosis", which is pretty much the M and B terminology for the Middlesex Hospital outbreak. It would be surprising if he had come up with that if he was unaware of M and B.
This is where the strange report from Alfred Freindly appearing in the LA Times in 1970 comes in. Although M and B were not mentioned by name one would expect the subject matter to have been noted. My original thought was that the article was syndicated and would have appeared first in the WP and possibly elsewhere as well. But there is a troubling "Exclusive" at the top of the article. Admittedly that may mean merely that it was exclusive for downtown LA, but the normal use has also to be considered.
Clearly the article was written with publication in DC in mind, otherwise the other US outbreaks and not merely Chestnut Lodge would have been mentioned. Did the WP know it was rubbish and avoid publication in an area where it might be seen by those involved, 17 years before. It might also have seemed strange to have described as hysteria an outbreak which all the resources of the NIH had put down to a " Bethesda-Ballerup strain of paracolon" infection, perhaps the NIH might have felt compelled to defend their diagnosis if publication had been in DC. Shelokov had, after all, been head of the relevant Department at NIH for a few years until 1967 or 68.
The question therefor arises as to whether those at the meeting did know, but weren't admitting it, or whether those who did know were not at the meeting. If the latter is the case that would support the contention that those involved in the original CFS description knew little about ME.