i would assume so, (even tho they just announced that mods can be used to remove music (not replace)), sound is usually used as a method of verifying a run. some runs can be spliced and if some of the sounds don't line up, that's a red flag seen often by moderators

I use a Genki Shadowcast and a HDMI splitter. The Shadowcast Capture card has a little latency so it goes to my laptop to record while the splitter sends a copy of the Switch's output to my TV. Then I use OBS to record me playing with a timer. Hope this helps!