Again, if you go to book ATL-UIO, you will see DL calls it First, not Business. Flights to Canada use F/P/A/G classes for F seats and yet also get lounge access. Are you going to say these are also "Business" Class because they are international and gets lounge access? The fare class itself does not really tell you anything. There is no Business/Business Elite class anymore. It's either Delta One or First. Anything out there that is still labeling seats "Business" simply based on J/C/D/I/Z fare classes is just plain broken.
Attachment 22791
Even though it says First, DL actually calls it International Business. These use the JCDZ fare class because that's how the rest of the world does it. First class anywhere else is true IFC. Thus creates confusion for those booking in other countries. The website though calls it First since it's geared towards a population that call it.