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This is the Magsik Alpha. The links on this page link to Magisk Debug latest version. The code hasn't been updated but the links and where they are the same as canary/debug official build.
For those who might be confused is that the official Magisk Alpha GitHub source (wrong, it is not) and why its Readme Download links to the official Canary (yielding somebody to wrongly think that Alpha is nothing else but Magisk Canary)
Back then in the late summer of 2021, Magisk v23 was still the latest official version
However, TJW (developer and founder of Magisk), who started to work for Google some months earlier, with his peers (some of them are now Magisk Alpha developers) started to work on the new Magisk v24 with the brand new Zygisk, DenyList instead of MagiskHide, removed support for the old Modules Repo, etc
The new code was already committed to his GitHub repo (changes were ongoing) but the new Magisk Canary v24xxx had not been released yet (afaik, it was soon afterwards, during the fall of 2021)
Guys (actually girls or more appropriately, young ladies, students) from the Alpha group released their Magisk Alpha and for many of us here (who dared to install and use) that was the first experience with what would soon come with the new Magisk v24 (for a long time back then in 2021, Alpha provided the new Magisk+DenyList but also the alternative, the old MagiskHide instead)
Btw, that was also the reason why they probably chose the Alpha name - it was like an experimental, pre-release, earlier than the Magisk Canary (and Magisk Beta) v24 came out.
(Another viable theory: They thought of themselves as Alpha females

)
And they had Magisk Alpha source code open on the GirHub (it remained open until the end of last year or so), and they themselves experimented with the new stuff through the Magisk Alpha installations, eg, developing/debugging modules like Zygisk-LSPosed (for that new Zygisk) and Shamiko (to hide Zygisk) - those modules were indeed developed and still maintained (btw, isn't Shamiko also closed source?!) from the same Alpha developers group
Hence somebody, that CoderThyn (sorry, I'm not familiar with that name but I think he was not part of Magisk nor Alpha development) forked their code
If you look to his GitHub project (you provided the link), you will see that it's frozen in time, 2 years old, last update Sep 2021 (screenshots below)
Btw, the same guy has another Alpha fork (the other screenshot below), 'newer' - albeit from Oct 2021
The Readme you see there is also frozen in time: Readme page (Alpha devs did not waste time on writing their own Readme.md but they reused TJW Readme from the official Magisk) - scroll down and you will see that it refers to v23 as the 'latest' Stable Magisk
(That old Readme had also a link to the Wiki - Wiki was recently removed since the author of Wiki is no more 'in' and does no more update his Wiki, although it would still be an excellent user guide for many)
All together, that GitHub link you provided is nothing else but the two years old fork of Magisk Alpha, frozen back in that time.
If you would fork yourself and build (assuming the source is complete there) you would obtain some Magisk Alpha v23xxx (as their version numbers were before Magisk v24 was released)
And the download link points to the (always the latest) official Canary since that's how it was in the Alpha Readme.md when CoderThyn forked Magisk Alpha back in Sep 2021 (again, once upon a time When the World Was New and Alpha was the open source)
Hence that GitHub project is not an up-to-date Magisk Alpha and its download link does not provide a link to download the Magisk Alpha (ie, when you click to 'his' Download and get the latest official Magisk Canary, it does not mean that Alpha = Canary - it is not and it never was)
Hopefully it resolves the confusion