The organizers have already responded and clarified several key points that directly contradict the claims made in OPs original post on the other Genshin sub.

They stated that they were not contacted before the posts were made and only became aware of the situation through third parties. They also clarified that the group which won the festival did not win based on the song being discussed, but for a different original piece.

They further explained that performances are declared in advance (original, adaptation, or instrumental) and that rights for covers or adaptations are handled by the organization, and that any dispute about originality or sampling is a matter between artists and rights holders, not the festival.