What a sad project but amazing implementation and vision. Awesome!
I was not informed about its history, so I checked, and discovered that it means "satiated" - so the current use of 'sad' comes from the idea of the discomfort that being burdened by too much nourishment brings.
You must mean that the project is very "satiating". Good: surely it can fill us with a most fulfilling nourishment. But I would have used the most unambiguous term.
I believe there is a certain element of sadness in that. However it's hopeful that he will continue experimenting with the lessons learned, so I wouldn't describe it as sad.