Why can't he come out and say that, why stay silent. He could come out and say look guys i missed the deadline because i encountered some serious bugs, i fixed most of them and now i'm gonna release 1 big update.
Because there is a shame-cycle creators fall into.
1) You have a plan, but life interrupts and you can't get the work done. You're pretty sure it'll just take another day or so.
You don't want to deal with all the disappointment and circle-jerking that'll happen if you tell everyone so you put it off until after the weekend, what's the harm?
2) But your next target still wasn't realistic. Either more life happened or you were too optimistic. Either way, you dumped a lot of energy into the project and just can't afford to spend more right now. Let's put off the announcement and update for another day to two to recover.
3) After recovering, you look at the last few days work and see a whole bunch of crap. You were too tired/distracted/rushed to do a good job and it needs another day or so to fix.
4) You look at the calendar and realize you are a week or more overdue. Where did the days go? The project really needs at least another week or more and of course it's better to spend the time and energy you have on it rather than damage control, right?
5) Quickly make a new plan to get it out soon. People have waited this long, it's better to give them good news rather than excuses, right? Go to 1.