Confusing indeed, and sorry about that, but there’s a logical explanation:
I posted this post first right after signing up and the spam filter flagged it and prevented it from posting. Then I went through the onboarding tutorial thread in my account which eventually told me something like “you can post now.” It had been 20 hours (judging by the timestamps) and no staff member had unblocked my first post (this one), I became unsure that it would be unblocked at all, so I posted the other one which went live immediately.
In hindsight I maybe should have deleted this post after getting responses on the other one, but I didn’t and I think the responses here have given me more to think about. I apologize if you perceive this as an annoyance.