If it did happen, it would be Zenimax/Bethedsa that would contact Valve.
Using my crystal ball and reading between the lines of that apology makes me think this isnt going to end well
GG dont want to piss off customers. More importantly, they dont want to piss off the publisher. GG might not pay the publisher for the keys they mispriced so the publisher will have to contact steam and invalidate the keys.
GG needs to step up and eat this, its their mistake, not the customer, not the publisher. Instead, they are hiding behind an apology that isnt an apology and refunds that are in store credit.
I have some experience with this, bethesda invalidated my retail serial for Fallout Vegas due to a Gamestop employee reporting it as a duplicate key after id registered it. (The gamestop i used to work in employees would take photos of the gutted PC game manuals and register the serials on steam before the game sold).
I had to jump through so many hoops to prove it was legit. Took 2 weeks and 3 different photos signing different code words on the manual to prove i owned it before they would give me my game back.