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No, it doesn't show as logged into any account for me. https://gaming.amazon.com/rage2-epic/dp/amzn1.pg.item.9b1ae1b0-efae-4caa-b99c-ca61c1c10c74 is enough to go directly to the game. Don't need the ingress or ref parts.

If you are not sure just open a private/icognito of you favorite browser and see what you get. Not just post a link to the internet and hope nobody abuses it

https://gaming.amazon.com/home

It's not buried at all.
All you have to do is go to the above link. Click on "Weekly Game" just below the rotating banner. All of your games are there in one place isolated from all the in-game stuff.

If you're new to Prime Gaming, then there should be a bunch of games there for you to grab.

Yes it's fixed.
I redeemed the game 2 days ago and I didn't get the deluxe edition.
Now I've justc checked and the deluxe edition appears as "in the library" in my Epic account.
So it should work for you (though it's apparently not fixed for everyone so I don't garantee the result).

Not quite. Rage 2 was there from the beginning, but since Epic had given away the base version of the game earlier, something went wrong and people who already owned that and immediately claimed didn't get the deluxe version as advertised and were still stuck with the base game.

Cue lots of people reporting this to both Amazon and Epic and they eventually took it down. They re-added it after they worked out the problem.

For someone concerned about achievements you don't play games a lot, your most played is RTCW with 18h and even then, that's some 17 hours more than rest of your library. Don't get me wrong, I'm just really curious since I always catch your "achievement etc." comment in Epic games deals.