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Did the English dub of Spirited Away add a bunch of random lines or what's going on here
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I'm rewatching Spirited Away with English subs I grabbed off opensubtitles.org and I had already been confused by some phantom lines that didn't correspond to any spoken dialogue but this scene made it obvious what was happening- there's extra lines added in places where the characters are facing away from the camera 
Either the subtitler was hallucinating or these originate from the dub. I grew up watching a VHS tape 
in Japanese with Finnish subtitles and I don't recall this scene having dialogue
I wonder what happened with your video clip that made the audio so quiet? I thought there was no audio at first, since I didn't hear anything even after cranking my volume all the way up, but when I threw it into Audacity I could see that there was a barely perceptible signal at like -80 dB. When I amplified the hell out of it I could make out the sounds from the scene (albeit barely poking above the noise floor).
I did some tests and it seems like Xbox Game Bar just lowers the volume of whatever you record by like 50% for some reason
I could hear the sounds on my computer but it is definitely pretty quiet
Edit: How's this
Man this movie is so fucking gorgeous why do we feed kids CG Disney slop at all
No awful smarmy humour either
Huh, I've never used the Xbox Game Bar but that seems odd. Googling the problem, it seems like another possibility is that that your system volume is low (even though it's plenty loud enough for you to hear it through your speakers/headphones) which results in low signal level for the recording; I know personally that if I plugged my headphones into my PC directly I would only raise the system volume to about 4-6%. You could try maxxing out both the system volume and the player volume (if applicable) but with your headphones/speakers off and see if that improves things.
Clip's still pretty damn quiet, but if I max the volume out on my phone (~4x higher than I'd usually have it) I can hear it okay.
My system volume is already maxed out since I have a volume knob on my headphones that I use to control volume instead