Well, now you've drawn my attention to it, then yes that's a good start. But a couple of comments:
If I go to the obvious landing page for CMX information which would be
https://cumuluswiki.org (or what then appears as:
https://cumuluswiki.org/a/Main_Page) then maybe I've overlooked it but I can't spot any obvious link to that About page. It could perhaps be linked in a separate yellow box right at the top of the wiki landing page.
Second, that About page could perhaps be edited a bit to focus on aspects that a completely new potential CMX user might want to read about and understand. For instance, the history of Cumulus (and eg the mention of Cumulus 2) is interesting but probably not of prime concern to a new user. Is it time to downplay Cumulus 1 also? Aren't new users encouraged to use CMX - it's debatable perhaps whether Cumulus 1 should be mentioned at all, except maybe as a limited Windows-only option?
Also, this is written rather as a text wiki (no surprise there!), but what's in my mind is something more like a brochure page that might capture the interest of a potential user rather than force them to read through a wall of text. I'm not suggesting a change from the wiki format, but presumably it might be possible to include some images higher up on the page and just bringing the page more up to date, eg one sentence there says: 'A variety of example screen shots are available for Cumulus 1, and those for MX will be added in the future.' Surely the screenshots for CMX should be there by now? For Davis stations, you need to go to the linked CMX page to find a first mention of the Weatherlink Live (WLL) logger/upload device, when it's actually the most popular 'logger' specified for new Davis stations nowadays. And no obvious mention of the benefits of using WLL and CMX together. And what about Airlink?
Absolutely no criticism intended here - I'm well aware of the time and effort it takes to maintain these pages by volunteers. But it seems a slight shame that CMX is not selling itself to the world quite as well as it could be. I know people are doubtless hard at work on adding detail to the wiki. But guess I'm just making a plea to think about newcomers too and create an overview page that would sell CMX to them as effectively as possible.