Apple is steadily removing even references to the old @mac.com and slightly less old @me.com addresses from its support documents. They may date all the way back to iTools and the iBook SE, but if you’ve got one of those addresses, you’re probably hanging on to it no matter what Apple does.
If you’ve been around the Mac long enough to have an @mac.com address, you’ve seen Apple trying to migrate you to @icloud.com. Now it’s removed yet another trace of the old, favorite email address.
Apple would rather you forgot Mac.com or me.com