> would it be too much to ask to not advertise the project publicly and wax poetic about how productive this (unavailable) language makes you

All the "public advertisement" he's done was a few early presentations of some ideas and then ... just live streaming his work

As well as "a few early presentations" (multiple hour+ conference talks) Jon keeps appearing on podcasts, and of course he's there to talk about this unavailable programming language although sometimes he does also talk about The Witness or Braid.