Afaik it's considered "stable".

There's 2800+ people in the discord.

And the community made a backup of the site https://archive.canvascommons.io/

Update: sounds like the author had some life changes and had to stop his YouTube channel which was the primary motivator for the library- but there are forks popping up (https://github.com/canvas-commons/canvas-commons).

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This notion that an open source library is "dead" and shouldn't be used because it's not being actively updated is a bit odd. You can fork and fix issues you have. It's got years of many people's work put into it. It's a great library and widely used on YouTube and elsewhere.