Most of the Distrowatch chart looks accurate
Some critic on the web pointed out that Mageia probably won't release a new version again for two or more years from now, where as Fedora will have 35 by November and 36 by May, etc.
I assume Mageia 8 is more of a fixed-release than Fedora 33, meaning certain system packages in Mageia do not get updated, for example: systemd.