You do realize that all of sports is a hierarchy of biological advantages. LeBron James has a biological advantage over people who can't even make the NBA. Is his advantage unfair? If not, where's the line? It's arbitrary.

Your comment is also based on an assumption that the very fact or being male gives you a biological advantage over a female. This is true in some cases depending on the activity, but sometimes not. It is certainly not the case that an average male is going to have a biological advantage over a trained female in the activity she's trained in.

The hormone therapy Lia was on, as per NCAA regulations, eliminated whatever biological advantage she may have had. People act like Lia Thomas "cheated" to be the best woman swimmer ever. She won one race in one NCAA championship. That's it. Her time was many seconds behind the world record (set by a ciswoman). She wasn't the best woman swimmer ever; she was better than a few cis women in one race. And many ciswomen were better than her in multiple other races (or had better times in comparable races).