As long as people understand that this is a rough estimate it's fine. I read "two weeks" as "about mid-March"
Publishing deadlines -> pressure -> negative impact on mental health -> decreased productivity -> shifting deadlines
At least he talks honestly and upfront about the current state of development and does not hide the delays, explains why that happened and how he plans to proceed. One could just post a couple of previews and say that everything is going as usual.
The only thing that encourages me is that there is only one last push to the finish line and the first release on Steam is a one-time event, so once it happens, all the extra work associated with it is gone. (reworking old chapters of SG, preparing a Steam version, localization into different languages, steam-related technical tasks)