Not really an expert in the topic, and so I can't comment much on the mechanisms why, but AFAIK there's a decent body of evidence that hypermobility is significantly more common in the ADHD + Autism populations than the general public....and I don't think there's much debate that those populations are more likely to be programmers than the general public.
Haven't reviewed in depth, but here's an example to support that claim that looks reasonably credible from a quick review - for some types of hypermobility at least, 5x more likely for Adult ADHD, we're not necessarily talking some kind of small/statistical noise level difference: https://pubmed.ncbi.nlm.nih.gov/34560594/
Haven't reviewed in depth, but here's an example to support that claim that looks reasonably credible from a quick review - for some types of hypermobility at least, 5x more likely for Adult ADHD, we're not necessarily talking some kind of small/statistical noise level difference: https://pubmed.ncbi.nlm.nih.gov/34560594/