During the demo epriod I did some testing and recorded a run for fun. I then pulled the video of my run in premiere and I started doing some digging.

My RTA time for this run was 10:59.90 while the IGT was 09:33.02, timing starts when you skip the first loading screen with the control scheme and stops when the last scoring screen shows up after the ending cutscene. I cut off from the video all cutscenes and loading screen as shown in the pitcure: the purple segments at the beginning and end are the parts before I get control of the game inputs and after i lose control of the inputs, the pink parts are cutscenes, and the green parts are loading times, the blue parts are the remaining gameplay. Counting only the blue parts, the time was still 10:03.xx, so the In Game Timer is pausing during something else other than cutscenes and loading screens.

I did another test removing all the slowdown bits and score screen after the fights and this time I got something more insteresting, as shown in the pitcure again: the purple segments at the beginning and end are the parts before i get control of the game inputs and after i lose control of the inputs, the pink parts are cutscenes, and the green parts are loading times, the blue parts are the remaining gameplay and the yellow bits are clips from the first frame the camera slowdown starts to the first frame when i get control of the character again after the score screen. Counting only the blue parts, the time was still 09:43.xx, much closer to the actual In Game Time and it's possible that by cutting manually i still have 10 seconds spread across the blue clips.

With this it could be very possible that the In Game Timer is tracking only when you've actual full control of Briar and not anything else. I posted my findings to the devs aswell but I still have to receive an answer but they said they will look into it and letting me know.

Do we know if it ticks at all during the memory sections with Lute? I'm gonna assume no since they aren't considered part of the chapters. There seems to be a lot of sections where there are inputs happening but no igt ticking, so rta is prob best like you said in your original post, until lrt gets solved on pc.

I suppose that's the case yeah, I'll have to test stuff out and try to contact the devs.