Well... they are 0 offset. Shop says it’s a miscommunication, which it may be. Who knows, at this point I am not sure it matters.If you can take a picture down the flanks, to give a better sense of poke, we should be able to help you confirm what offset it is. It should also be stamped somewhere on the wheel barrel or hub.
Do you have the model number of the wheel? Is it MRWZMR30578558800 from the screen cap you posted prior? That would be another way to confirm.
My options are BMC for $300 on the 2nd or spend $600-$750 to change to the 18” wheel which does have the +25mm off set and wait until July 11th to do it.
I don’t mind the ride with the wider stance but I am not to keen on tampering with the “frame.”