It's not clear to me if the patient is confusing antivirals with antiretrovirals. She does mention tenofovir, but that was unrelated to what her doctor said. She just said that her friend was getting tenofovir, not that Dr Weir said anything about patients getting tenofovir.
"He believes ME is caused by a virus, he seemed very confident they are going to be an available and effective treatment. They have difficult side effects and for that reason the patient's GP had to be on board. He seemed to prefer this option to Rituximab because RX wears off."
That sounds more like antivirals to me, but it could be referring to antiretrovirals. We'll have to wait and see. I wouldn't advise getting hopes up too soon. It would be amazing if it turns out to be true, though.