Maybe I missed it skimming the Kickstarter project site, but is this going to be based on some self coded platform or is he going to use a well established platform like StatusNet/GnuSocial (https://gnu.io/social/)?
I'd be interested to know that also. From first appearance it looks like it's similar to Mastodon, which I believe is based on GNU Social:
From what I understand it's going to be custom, but with integration to existing protocols and standards in the space (Webmention, OStatus, ...)
It sounds like a simple blog platform for blog posts with short content and no title only, including syndication (RSS/atom) and some subscription functionality. Details are discussed in a not so Open Web Slack channel for backers only, though.