tldr; The issue was the proximity sensor. I opened the iPhone X, disconnected it, and the iPhone worked (without Face ID). I hope this can help others who have the same problem.
I didn’t cover this in the video, but I used this product to get my iPhone out of recovery mode. It’s a paid product, but the part you need to get out of recovery mode is free:
Video I used to open my iPhone X:
This video put me onto the proximity sensor issue (thanks!):
Some videos that may help with Face ID fix (I haven’t investigated these):