It's understandable if game updates slide. It's a living thing that grows under developers' hands and it'd need tweaking and partial rework along the way - all good.
What is difficult to understand with this dev are the missing status updates. Especially if you announce them, only to treat your Patreons on the promised date to a deafening silence. Nothing creates mistrust and suspicion like that.
On the whole, I prefer a high quality update that's slightly late to a half-baked one delivered on time. But the dev needs to put his cards on the table. If the schedule goes pear-shaped, be open and honest about it - do not go to ground and leave people guessing.