Honestly, after seeing who sent this claim, i'm not surprised. The Orchard Music group is quite infamous for similar cases in which they would copyright videos for containing music that in most cases was free music that the creator allowed people to freely use. In this case, they're striking content on a video that contains content from Bandai Namco, and that's even more absurd.
Unfortunately, these guys have lawyers (who love striking down dispute). Unless Namco steps in, sending your own dispute is going to lead to more trouble.