Perhaps the Jeff Smith Captain Marvel lives on Earth-5; while the new guy in the hoodie lives on Earth-DC.
I notice that Earth-1 is conspicuously absent from that list. Is the current Earth-DC considered an altered Earth-1, or is Earth-1 something different? Or did it now never exist? Maybe it had to be erased because of the existence of Superboy. Given that the current Superman seems to have now had a history with the Earth-1 Legion, I'm speculating that the new Superman incorporates his Earth-1 counterpart.
And talk about complex! Not only was there a pre-Crisis Earth-2, there is now also a post-Infinite-Crisis Earth-2. So all those pre-Crisis Earth-2 stories may or may not have actually taken place on the post-Infinite-Crisis Earth-2; and if they did, they probably happened in a different manner from what you actually read.
I'm glad I'm as old as I am or I'd never be able to keep it all straight!
Jeff Smith DID say it was canon.
Earth-5 not to be confuse with Earth-S...
Earth-2 not to be confuse with the pre-crisis Earth-2 or the Post Crisis Earth-2 which is now Earth-3 which in turn should not be confuse with the pre-crisis Earth-3...
... brain melts...