The version on F-Droid works on my system.

checks

Looks like the F-Droid project hasn’t seen a new Android build in a decade, and Maxima has seen updates, but…I mean, it’s a pretty mature program. I have a newer version on desktop, but all the stuff I use was added in the first couple decades or so of its life.

EDIT: The git repo is here:

https://github.com/YasuakiHonda/Maxima-on-Android-AS

So I expect that if someone wanted to do builds of newer versions, they could.

But for perspective, the calculator that the article is talking about that the author liked is also a decade-old calculator.