I took a quick look at what the "Wikiproject intellectual diversity" was actually monitoring. Specific articles or categories about things Mr Sanger finds interesting,right? Well, indeed: specifically it's all arbcom, admin elections, policy pages. You can check it out here: https://en.wikipedia.org/wiki/User:Larry_Sanger/WikiProject_...
Then he canvassed people from outside wikipedia to help with that project.
So he claimed to be doing one thing, but in reality it was more of a thinly disguised power play by the look of it.