I just found a couple old USB HDDs, one of which I used for all of high school (and later) the other was more ~2013-2018.
High school (USB 2) one is empty, running Recuva now to see if I can recover any old clips or photos.
The other one had been mostly loaded up w/ TV shows to plug into our TV a few years back (Arrow season 4, Supergirl Season 3, some Dragon Ball Super) BUT it also had a big vault of my PS4 clips and screenshots I dumped in 2017! WILD.
Wellp. Despite Recuva saying most of these were OK to recover, only a tiny handful actually work. Attempts at using Stellar Video Repair have not been successful, even on the AVI files.
Unfortunately, recovering my pre-2015 videos seems impossible, but I have found some of the stuff that I lost when trying to backup to Amazon Cloud drive!
Including a rare look at me still using Vegas, and Halo 5 launch gameplay!
IT FINALLY HAPPENED!
I found some older HDDs that actually had older videos on them! 2010-2015ish! Pre-2010 is mostly impossible to find/recover, but this is still awesome!
I never really got much use out of Magic Lantern, but I think it provided more benefits later on than when I used it. I know for some cams it unlocks crazy capabilities, but for T3i seemed like just small stuff. I used it for a timelapse at one point.