thought this case was more nuanced than a trans woman entering a woman’s sports in order to clean up the prizes.
Not really - both are a man knowingly entering the incorrect category, trying to steal prizes from women.
The history leading up to their decision to cheat is irrelevant, and the history generally is unclear anyway - "raised as a girl" claims tend to be rather sketchy - rather just a case of "well, they would say that, wouldn't they". There might have been a birth misclassification, but being male would have become obvious at puberty, long before the Olympics.
If there ever was a time they were genuinely unaware they were male, they had an ethical responsibility to withdraw from female competition as soon as they knew they were ineligible.
Erik Schinegger is an example of someone who did do the right thing in the 1960s, but unfortunately was punished by being unfairly barred from attempting to qualify in the male category:
There has never been anything stopping Semenya and Khelif from doing the right thing, as Schinegger did.
What does dsd and 46ard mean? Male chromosome?
DSD = Disorder (or difference) of Sexual Development - a more accurate and preferred general term for "intersex" conditions
5-ARD 46XY = the specific DSD condition that Semenya and Khelif have, that is deliberately scouted for. It can lead to misclassification as female at birth, while having absolutely no impact on general male body development beyond the genitalia. Hence producing the ideal athlete - someone with full male ability but female birth ID.
en.wikipedia.org/wiki/5%CE%B1-Reductase_2_deficiency