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According to the Wikipedia page, it seems Janae only competed before transitioning in men's weightlifting, at which point he[1] held several world records.

So, to answer your question, the reason Janae does not hold a gold medal in women's weightlifting, is that she never competed as a woman.

It is not really comparable to an average, non-professional athlete competing against a professional athlete. A fair comparison would be Lebron James competing against Breanna Stewart (WNBA Finals MVP) or the LA Lakers competing against the Houston Comets.

And hey, that might be interesting! But it's not currently what we're doing. Again, if biological sex doesn't make any difference in sports, then why even have separate men's and women's competitions at all?

[1] The Wikipedia page notes she uses male pronouns when referring to the time before transitioning.