I'm speculating here, but maybe Ron doesn't agree with Prusty's HHV-6 theory. He has stated numerous times that they don't find viruses in the blood, and that you should be able to detect them there.
Naviaux is on the SAB of OMF though, so a bit weird.
In Prusty's presentation at the NIH conference in 2019 april he mentions that HHV-6 inserts a 6 nucleotide sequence into the DNA or RNA (Not sure) and that this is not detected by the immune system just like immune system fails to detect most types of cancer because the cells are our own. This 6 nucleotide sequence it seems is common to many viruses and it acts as a trojan horse. I have a gut feeling this causes the mito fragmentation and weakens the cells defence against future viral attacks.
After the Presentation Prof. Jose Montoya stood up and asked the question about this 6 nucleotide sequence and what it codes ? I dont remember the reply Prusty gave. But he said this is key to many mysteries surrounding the stealthy viruses. So the HHV-6 infection or its entire free nuclear material need not be present in the tissue or plasma but still causes problems. I feel this makes the immune system go into attack mode and after some time the immune system gets exhausted and that is why we are seeing ageing of immune cells. This is purely my speculation trying to connect the dots.
ME need not be due to this. Prusty himself said so during the presentation. But the fragmentation of mitochondria is the key to the disease. Since once you starve the cell of energy naturally the cell tries to conserve energy for the essential processes and shuts down or minimizes the not so important processes. This in the long run causes symptoms which are reflective of the individual's genetic defects and weaknesses.This is Naviaux's postulate. That is why when you try to group people according to symptoms and see what the underlying commanality of that particular subgroup is you are not able to see anything of statistical significance.