I'm not sure why but I'm able to disable them on mobile. The tricky part is guessing what the original track is. I'm on YT premium which might be why?
I think the ideal functionality would be having (ORIGINAL) next to the audio track that isn't dubbed and have that set to the default setting.
I think if they can get the dubbing correct and actually working as intended, that would be incredible for opening up cultures for everyone. I think crossing language barriers is really cool.