Mathematica also has god-tier documentation and an interesting and very unique programming language.

I personally hate programming in Mathematica, but it is interesting and deserving of an open implementation.

From the article "...with all its computational intelligence, algorithms, knowledgebase, and so on"

But the "its" that the article is referring to is the Wolfram Engine. It doesn't say that is all the algorithms in Mathematica. And the Mathematica website lists Algorithm Base and Wolfram Engine as two separate line items, which is at least surprising if one is contained in the other.

I actually believe the Algorithm Base is probably included, but it's definitely anything but clear from the website or any of the press release. The Mathematica website makes them seem like two completely separate unconnected components.

It's really unclear what is included in Wolfram Engine and what is included only in Mathematica... the above was just one obvious example. It would be very nice to have a concise list.