Why should chess and darts be treated differently? There’s evidence that males have an advantage in darts:

https://www.mdx.ac.uk/news/2023/2/linda-duffy-darts-psychology/

Given how many sports that males have an advantage in, it certainly seems reasonable to have sex-based competitions as the default.

Imane Khelif, Lin Yu Ting, and Caster Semenya are all biologically male (not trans, DSD males incorrectly assigned female at birth). No cis women won a medal in the 2016 Rio 800m, all of the medal winners were DSD male. That would likely continue to be the case except they are no longer eligible for the women’s category.

Michael Phelps’ records have already been surpassed. DSD males competing in women’s sports set records that cis woman will never surpass. It is not surprising that the vast majority of people find this unfair. The IOC is doing the right thing.