Kinda. Same as me, they know why the launch failed, but don’t say anything about why the notifications didn’t get sent.

Steam has a section for the developers for setting up the release date. It specifically states that you need to be careful with it, because two weeks before that date you start getting visibility on the “upcoming releases” list, and will then show up in the “new releases” section, and once that happens, you can’t change it.
And Planet Centauri is showing their official release date as being “3 Jun, 2016”, not the 2024 date they left Early Access as it’s supposed to. So did they mess that up and the notifications were actually sent, but they went out nine years ago?