The article may require a re-read. It's pretty clear C-AUTH certification comes from the USB-IF.Apple shouldn't roll their own, if auth is part of the USB-C spec then great. If it's not part of the spec Apple shouldn't do it. If it needs to be added to the spec, Apple has enough leverage to make that happen. But any cert fees should go to the consortium not Apple.
The charger doesn't have to be genuine Apple. It has to be C-AUTH certified. Two different things.There will be the MFI chip in the lightning end of the cable that will identify the cable as being able to handle the charging current. Then the phone will handshake with the charger to identify it as genuine Apple high speed phone charger.
Apple is part of the USB-IF. In fact, they are on the Board of Directors. Apple's chargers are already C-AUTH certified.A very bad move by Apple if they take away the ability to fast charge with all my USB-c chargers. My iPad Pros and iPhone X have been charging well with all those chargers. They are not cheap (both in quality and price) chargers at all.