Wikifunctions is a new site that has been added to the list of sites operated by WMF. I definitely see uses for it in automating updates on Wikipedia and bots (and also for programmers to reference), but their goal is to translate Wikipedia articles to more languages by writing them in code that has a lot of linguistic information. I have mixed feelings about this, as I don’t like existing programs that automatically generate articles (see the Cebuano and Dutch Wikipedias), and I worry that the system will be too complicated for average people.
Your description doesn’t seem to match what the site does? For example the front page has a function that converts uppercase text to lowercase text.
It’s not article content - it’s an interactive utility.
The site itself is for contributors who want to create functions and write code for them. Examples of how it might be used in the future for articles: