I just saw a video from Modern Vintage Gamer (previously know as Lantus, who ported a ton of emulators and stuff to Xbox back in the day) and he had the same suggestion. His was leaking and he removed it in the video. I'm sure there's no harm in doing it, but if you haven't used your Xbox in 15 years it's probably fine for now. Capacitors only leak from use, unless iltheyre physically damage or something.
Having said that, the clock resetting every time you power off can be incredibly annoying, especially if you're using the default Xbox dashboard, or a modified version of the original.