I'm afraid an academic imposing their pre-ordained conclusions on research is a pretty everyday occurrence. It of course goes profoundly contrary to the principles of academic work, but that doesn't prevent it from constantly happening. An often-quoted refrain about the study of history goes that Whig historians write Whig history, Marxist historians write Marxist history, Christian historians write Christian history. Now it's important not to conflate Walitt's very low quality research with a huge body of historical writing - many Marxist historians have written Marxist histories which are truthful to their primary sources and which have added a great deal to our understanding of the past. So there's a spectrum here, and what Walitt has done clearly constitutes bad research. However, there is a very significant difference between bad research and research misconduct. If people find evidence that Walitt tampered with findings, altered figures or something along those lines, then he should absolutely be reported for misconduct. But if you're dealing with academics, you have to play their game to some degree. Prior to falling ill, I was on track to become an academic, and based on my experience, academics will turn their noses up in response to lay people making criticisms that aren't very, very well founded, so if you're going to make a research misconduct complaint, it has to be right on the money with a great deal of evidence.
More broadly, I'd caution people against applying the PACE trial playbook to this study. It made sense to go after the PACE trial hammer and tongs because it had such a direct influence on national and global guidance around harmful treatments. The same applies to the Cochrane review to some extent. This study is in a slightly different category.
In my view, the most important response to this study isn't academic but political - I'd draw not from the PACE playbook, but I'd look more at Long Covid advocacy or AIDS activism. In the time since the Walitt study was published, about 5-6 major Long Covid studies have been published in top journals, two from Cambridge groups, another on brain fog and the BBB, another on cognitive impairment post COVID in the NEJM, and there was a recent pre-print by Iwasaki and Putrino. The truth is that a singular study should not matter a great deal. Sure, it was $8 million, but $8 million is peanuts in the context of medical research. In the Long Covid world, because there's far more research going on, if there's a bad study that comes out, it's far from the end of the world, because within a couple of weeks, several more biomedical studies will come out.
I know this forum leans heavily towards scientific discussion, so the natural response of a forum like this one to a paper like that will be the PACE playbook, but if it were me, I'd basically copy the Long Covid Moonshot in response to this study - I'd demand something like $200 million a year in research from the NIH, and find any way to put pressure on them to that end. With the PACE playbook, yes you may refute many of the study's conclusions in a year or two, maybe even longer, but the fundamental state of affairs which allows for people like Walitt to assert themselves in ME/CFS research - the complete lack of funding for biomedical research - won't shift. You can win individual battles with the BPS lot by vigorously responding to and refuting their arguments, but you can never achieve a lasting victory that way. The only way to achieve a lasting victory is to guarantee sustained, long-term funding for ME/CFS research, and that's fundamentally a political fight rather than a scientific/academic one - it belongs much more to the tradition of the AIDS movement than something like the PACE trial.