Look, I'm very supportive of people living their best lives whether they be straight, gay, trans, green or dwarfs.... But competing in sports is bit of an exception, or it needs to be. If a male transitions, she may well have the appropriate hormones for her self, but she's got the muscle mass, probably height/size of her former self. Yes, I appreciate that muscle mass is likely reduced, but it's probably still a lot larger than a a young woman who was born that way.
Even looking at the video of the race, well, you know the expression, "He runs like a girl!" says it all. The girls are all running like, well, girls. The subject of this news item most definitely doesn't "run like a girl"... she runs like a dude with long hair and a skirt. Her stride is different, her arms swing differently.
And to address your sarcastic comment about the world.. Well, a trans athlete WON'T change much in the world, but to the young lady who comes in second to this trans athlete it means lost scholarships, a shot at the pros and more. Second means nothing in sports.