I'm not asking him to open source anything. I've given up any illusions that that would be happening ~10 years ago.

I'm just cautioning other people to put any stakes into a language that's from its organizational bones doomed to fail for any outside party.

While it is not open sourced yet (to be honest it is not as important as you think, many programming languages are mostly implemened by a dozen people, even a single creator is not rare) it is not like he forbids anyone to ask for being beta testers, just like the blog writer.