You can't prove a negative. You need to provide a source that trans women "keep winning in every sport that requires strength and endurance." keep and every are big claims there.

The truth is more nuanced and highly depends on the individual person and their history. Some trans women never go through a male puberty, for example. Trans women on estrogen and testosterone blockers lose a significant amount of muscle mass. Depending on the sport that can actually be a disadvantage because they're moving around typically heavier phrames with less muscle. There's also differences, typically, in things like center of gravity. Less muscle mass (for their size/frame), a heavier frame, and higher center of gravity could cause a disadvantage for an individual in sports like wrestling, as another example.

The truth is we don't actually know very well, scientifically speaking, and it needs to be studied more. A big problem in studying it more is that there are so few trans athletes and the sample sizes are very small.

Saying trans women are flat out better in "every sport that requires strength and endurance" is outright hyperbole bordering on being flat out wrong and does not engage with current scientific knowledge on the topic in good faith.

Never been a huge fan of his humor personally, but the core content here is nuanced and on point. https://youtu.be/flSS1tjoxf0