OKAY, So after trying a few more things, I was able to get libTAS 1.4.6 to work on WSL. So, not knowing if the other version would be verified, I had started redoing it for a second. Damn. Time. (I feel like libTAS could have mouse scaling & offset for things like this, maybe it will someday.)
More importantly though: I've also made two improvements in so-doing. The first one is to set the first digit of the combination on the 5th floor to eight, not by counting forwards from 1, but backwards so that it goes to 9 quicker (which I don't know how I didn't think of before). The second one is that I've figured out how to utilize the menu screen to save time. If I go to the menu before a room is finished scrolling, then it will snap back to where I started while playing again, saving a few frames in one spot.
Also, the gui seems to be part of Ruffle, so I'm not sure that'd be different by system setup. But on WSL I wasn't able to replicate the high DPI settings I was using while recording this. Anyway, it should be all fixed.
Sorry, I hate to do this last minute. But I request that this be tested before anyone goes through with the publishing of it.