Thanks for taking the time to work on this. While looking at the alt text you added and reading the issue you linked I started thinking about "what makes a good alt text?". I found this comment and the one after it useful. As well as the content they link to.

Instead of repeating the name of the figure as the alt text I think having a short description a la http://diagramcenter.org/specific-guidelines-g.html#71 would be a good alt text. Describing the important parts that can be seen in the image. In this context I think "important" is about "what do I need to take away from this image to better understand the text?". What do you think @marekhanus ?

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Sorry @betatim, I forgot to change it.

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I think this should be a better alt.

Thanks @adrinjalali.