I've found some years old runs of Grisly Manor. Some of them cut off the final cutscene, but we could still add those in since the cutscenes have very little time variation, so we could add a fixed amount of time. I found a 5:21 by Barnabus Owl without the ending cutscene that I think would be about a 5:44 with the ending cutscene. It predates these forums by about 3 years. Also, a 6:15 by Pozitif bir OYUNCU from 2021.

They have to submit their runs. No one else can without their permission.