No, Nick is still writing SUPERIOR FOES OF SPIDER-MAN–there were just a pair of fill-in issues commissioned to try to get the series coming out on a more regular schedule.
And relaunching SECRET AVENGERS grew out of the book being handed over to Ales Kot, but wasn’t done specifically because Nick left the title.
And as you say, Nick is also continuing to write AVENGERS WORLD. And who knows what else might be waiting down the pike?