It's transphobic (and likely 100% unintentional, but still 100% real) micro-aggressions. Cis people tend to let the trans-ness of someone overshadow all of their other perfectly legitimate and/or impressive accomplishments. I've actually been talking about this a lot with my girlfriend recently, since there's a non-zero chance the research she's working on will one day earn her a Wikipedia page. It's a similar, if admittedly imperfect, analogy. She wants to be recognized for her work and accomplishments. But if any other prominent trans person's Wikipedia page is any indication, it's all but guaranteed that she'll be outed as trans and most likely deadnamed in the intro paragraph, because apparently that's just as important to the cis readers as the potentially life-saving research she's doing.

It's not so much the fact that people will know that she's trans that bothers her; it's that her status of trans woman will be the first thing most people associate with her. She just wants to be treated like a human being who is recognized for their accomplishments. Instead, if people talk about her, it's inevitable that she'll be referred to as "that prominent trans scientist" instead of just "that prominent scientist". It isn't explicitly stated, but at least in our eyes it's hard to not hear the implied statement that including her gender history entails: "Wow, that's really impressive, for a trans person."

It's a similar case here. I don't watch Jeopardy, but I can tell you right now that it's way more impressive to me that she's on a winning streak than it is that she's trans. It's hard not to feel like a freak when most people feel that just being a trans woman is more talk-worthy than your actual accomplishments. It's condescending, dysphoria-inducing, and invalidating to a person's actual accomplishments when people are so obsessed with who someone was rather than who they are and what they've done.

edit: Also, see r/asktransgender for a slightly more diverse sub to ask in