You’re thinking of multiplayer launch dates (or windows), of which there have been quite a few – the first targeted the year of 2021 in this announcement. This was followed up with several multiplayer development update blogs throughout 2021 that ended with the realization that multiplayer wasn’t coming that year and that they’d need more time, as noted in the November 2021 update.
Further multiplayer dev updates came in 2022 with the June dev update announcing that the next update would be 0.9. While no date was given at that time, everyone in the community seemed fairly confident that it would release sometime that year, which was further emboldened by this statement from Stanzwar during the Ziz multiplayer interview on September 14, 2022:
While he didn’t officially state a release date for 0.9, he did announce that they were indeed targeting that year. Obviously circumstances changed and they didn’t make that internal release window, with EHG later locking it in for March 9th, 2023 in the December dev blog.
However, as far as game release dates there’s only been a couple and those were quite some time ago. The first was April 2020 from their Kickstarter, which was then pushed back to Q4 2020 in this announcement, and finally to “when it’s ready” in this announcement.
Though not officially stated in a dev blog or announcement, Judd did mention in the in-game chat (on March 10th & 11th) that they’re aiming to release 1.0 by the end of this year. So there’s at least one more “launch window” that EHG is currently targeting for the game.