Please tell me it's a joke!
No, its something many advocates have been against for quite some time. Yet there is a joke on them, as their ideas will most probably only work (except pacing if done right) if they recruit poorly diagnosed patients.
I am an ardent video gamer, but I am forced to avoid video games that involve any adrenaline, or too much physical activity, and even the very low activity games I have to pace. I fail very often because I love to play some games, especially in coop with other ME patients, and I overdo it.
My prediction, if they ever complete the study, is they will fail. The biggest worry appears to be a dearth of objective outcome measures. Subjective measures in an ME or CFS intervention should be considered highly unreliable.
The other problem is that at the mild end of the severity spectrum ME patients are not less active than sedentary controls. They just operate in short bursts, and have to rest between bursts. I think this showed up in some actometer study many years ago.