Does there need to be ingame sound? Because if I am in a call I dont want to record people their voices because streamlabs OBS automaticly records discord and I don't know how to stop it.

Yes, without it, there could be splicing in the runs, as sound is a key giveaway when splicing is used. And I'm pretty sure there is a way to make it only record the game sound.

Ingame sound is used as a security measure to detect illicit runs.

Here is a guide on how to only record ingame audio. (different game but works anyways) https://www.speedrun.com/karlson_itch.io/guide/41pfa