it is important to understand the level of physical fitness/performance [trans] individuals possess relative to their cisgender counterparts. Unfortunately, there are few studies investigating this topic, and several complications that confound this research.
And skimming through the article extremely quickly, they say in several places that the data shows trans people do have at least a slight advantage over cis people.
And on top of all that, this is a review article, not a study. A review article is just someone’s overview and discussion of a topic, kind of like a newspaper op-ed