n+1 here, but in my experience, I agree with this. I'm sure part of this is because I was really fat for a long time, lost a lot of weight, and had residual muscle mass from carrying that weight. But part of it also is definitely because I transitioned later in life, but went through testosterone-based puberty. I have 22% body fat, which is pretty normal for a genetic female in good shape. However, I'm also 6'3" and have 163 lbs. of muscle mass, which I'm certain is 99th percentile or higher.
For those reading this that have opinions about trans kids, please keep an open mind. I knew that I was different as early as age 6, and the only reason I didn't transition earlier is because it just wasn't possible in that social environment. Things have changed, the science is pretty sound, and a lot of discrimination we face is based on how we look. That all has to do with puberty. A trans person who has experienced the correct hormones during puberty is virtually indistinguishable from their cis- counterparts. And, relevant to this discussion, does not have this built-in athletic advantage.