It hasn't been confirmed as an official single by Rihanna or RocNation so far, to my knowledge. Tidal used the phrase "new single" when they first tweeted about AO, but they could've have misused the term "single" when they really meant "song"?

We don't know at this point but Pop is clearly not here for BBHMM so if they want to promote a single at Pop radio, the follow-up to FFS on the format, before the album comes out, then they can push AO.