I thought the trades were pretty clear, or at least there was a follow up article that stated Superman will indeed be Black and it will be a "Black Superman Story".
Now, that doesn't necessarily mean that it will be a race swapped version of Kent, Val Zod, or Calvin Ellis. It could be a brand new character who Coates has created ,with an entirely different origin, supporting cast etc unconnected to the normal Superman myths. That could also be what Coates pitched and WB liked.
I think WB would have clearly it up if they weren't going for a Black Superman in the next film. So, I don't think there's any jumping to conclusions in terms of this Superman's race.
Who this Superman is? Where this Superman falls in the multiverse? and whether or not this is intended for Theaterical or HBOMax ? is still unknown to us , and it could be the answer to all those questions will surprise us.