It's not the debunked claims. As someone that did compete in sports in high school (albeit poorly), the story does check out. Sports organisations are underfunded and end up becoming circular/annulation like organisations in which athletes parents, loved ones, family, etc get involved and take up senior positions. I've seen it happen before.
Even outside of my personal experiences, the stories about athletes having one of their parents as a head coach are pretty infamous, or just famous, depending on how good the athlete is. I don't think anyone cares that Armand Duplantis' coach is his dad for example, he's the world record holder. However, you could argue that when this happens in more "subjective" sports, that there is a high potential for cheating, especially in organisational positions outside of coaching. There's a strong argument there.
How Raygun beat Holly Molly (the dancer in the video you linked) in the preliminary rounds is addressed in the original video I posted, and yeah it's a very dodgy situation. One of the members of 143 Liverpool Street, J1 is listed as a judge lol. Her husband, "Sammy The Free", was listed as a judge in another preliminary competition.
Look here, you can see J1 listed as a judge in the video description
Here Raygun's husband is listed as a judge lmao
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: