“Delayed” sounds intentional somehow.
Apps are published when an update/build/sign cycle ends, and that time can’t be predicted, due to various factors (number of apps, per app build time, server issues etc). If the dev just says “the bug is fixed, I’ve tagged the repo, why don’t you publish?!?!?!?!” that’s kinda unjustified if not nasty.
See this discussion: NewPipe update request - #16 by Ildar