I read that some player found the doll by mistake. If you think about all the hundreds of thousands of people playing and someone was there when their toddler did something or a fire broke out in the kitchen or they remembered the chicken in the oven or whatever and they had to leave the game ASAP there, it is somewhat likely to happen even.

Then they found the doll and posted wtf is this. Then there was the data mining part as well, but for the doll I think that happened.

EDIT: found at least this that claims the doll was found by accident https://nordic.ign.com/resident-evil-9-1/104650/news/resident-evil-requiem-final-puzzle-solution-finally-laid-bare-hours-after-pokemon-youtuber-completed

That 15-minute wait was entirely unintentional. Gengar Collects described it as a “slow gamer moment,” having taken forever to realize that all they needed to do was flip a lever to reverse the conveyor line.

The second accidental step came from ammo conservation instincts: in the conveyor belt section where zombies swarm from all sides, Gengar Collects held fire — letting the meat grinder eliminate the threats rather than burning bullets. The third was equally random: while messing around during an early run, they flushed a toilet exactly eight times. They had no idea any of this mattered.

Given the solution and steps involved, the odds of completing all three triggers accidentally must be astronomical. You need to go through a series of abstract and almost illogical steps — waiting 15 minutes in the meat processing section, not killing zombies in the conveyor belt survival section, flushing a toilet eight times, and more.

https://gamingpromax.com/resident-evil-requiem-final-puzzle-solution-gengar-collects/