Lawfag here, Europanon.
I think it's mostly shills and newbies who believe this completely unrealistic theory. This would assume that an entire BRANCH of the US Government is in on a fraud, including Justices and clerks who have known RBG for decades and clearly would know better.
The real interpretation of the Q drop is that the audio IS the proof of life in the absence of verified recent photos. Couple this with the "artificial respirators" comment from POTUS later in the week, and one might conclude that RBG, who had half of a lung removed late last year, needs oxygen or some respiratory support.
This would explain vocal irregularities (such as they are) and also a lack of photo attention.
Politically speaking, a dead or dying RBG is a freaking wide-awake nightmare for the left. She is clearly on her way to the grave and the last thing they want is to panic an already-panicked Deep State into knowing that Trump will get another SCOTUS pick this year.
Occam's razor. There is no full-scale conspiracy afoot on the high court of the land.