Ah, the old canard. "Heads, I win, tails, you lose."
Players can imbue their characters with knowledge that a character would not have. Because that's fine. And because meta-gaming just is.
And, of course, if a player messes up, by the magic powers of reverse incorporation of meta-gaming, the character has imbued the player with the knowledge that the player should have known.
This has been a short, but enlightening, series in "The real answer to all questions is that my desired outcome prevails, regardless of what happened."
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Dm commuted lie of omission in not mentioning clearly visible ring
I also mentioned that the ring was placed on the gauntlet in such a way, that it was stuck there (think Sauron's armor with the ring).
He did mention it.
Not in theshop
Not in theshop
But it isn't up to the DM to play book keeping for the players. He remembered all the magic items when they were on the big bad, now the players have the equipment. Sounds like their job to keep track of now.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.