OH RLY?
Who is this all powerful organization ("the left") that can "shut this down"? It's dishonest to think people who you may consider to be a part of "the left" want TG girls/women competing athletically against biological women, the majority of "the left" don't support that position.
I've been saying this for a long time, this is what athletic associations/committees/unions exist to address. A few have, but the vast majority have not or just continue to ignore it. Looking for political solutions to this is a wet dream of the current GOP because simple people buy their lies and their narrative that this is a goal of "the left". It is not. But BAU, people lap it up because their team says so. It was apparently effective with you at least.
Here's a short list of who is actually responsible and can cause reform/change:
IOC
NCAA
AAU
All 50 states High School Athletic Associations