I agree that it is a sobering number. I don't expect Reddit to die by losing 7%, but that number probably represents a very large absolute number, some of which is directed at alternatives like Lemmy and Kbin. If a threshold has now been passed (which I think it has) and the alternatives are/will offer a better solution, then in time Reddit may be in trouble.
For me the "win" since the start of the black out has been whether alternatives can be legitimized.