Just because some flags were declined doesn't mean you never flag, ever. The flag could have been declined for various reasons and previous flag judgement has no bearing whatsoever on future flags(unless there is a long trail of such frivolous flags which I haven't seen here till now)
At the time I posted the above not only could I not vote (capped)
Okay, that's a limitation that you have run into because you have hit your vote quota, not others.
and dared not flag but I couldn’t review (the occupied queues required votes)
I still don't understand why you wouldn't spam flag an obvious spam
dare not edit (“front page flooding”).
So back off for an hour and edit it it later. Anyway this isn't a post that needs to be edited.
So it seems I was blocked from all housekeeping chores (†)
As I've mentioned, you're not blocked, neither are others
and that seems a waste when so much housekeeping is still required (IMO).
And others will look into it.