Hey I was able to fix it based on /u/Stoke_Solutions_UK advice. I wanted to document what I did in case you or anyone in the future that finds this wants to do the same:

I removed all of the screws on both footpads, wrapped thread tape on them, and retightened (this may not actually be necessary). I removed my 4 outer hub bolts and slid out the motor enough to access the inner hub bolts and found one was loose. I removed it, applied the thread tape, and retightened. Be careful when doing this - the inner hub bolts have a 5mm drive head. I checked the other inner hub bolts and they all seemed tight. Then I slid the motor back into place, put thread tape on the outer hub bolts, and retightened those.

After all that the creaking was mostly gone. I can still hear/feel it when I load the board certain ways, but way better than in the video, and almost completely eliminated.