I was similarly (to GP) confused about this as "news", since Insomnia's been my go-to GQL tool this year.
Ya it has. I didn't realize it was so long ago. Made a landing page for it today and thought I'd toss it up on HN for fun. Didn't expect it to jump up so high. Woo!
Just a guess, but it may have still been under development. I think it’s pretty common to not do a release on new features right away.