Edit: I don't mean this in a gatekeeping way, I honestly was just curious to hear an example of how this happens. Do people outside tech have someone in tech mention the site to them? Do they browse and just read the fraction of articles that aren't about something software related?
I got to HN itself ... I don't know how. I delete my account about once a year to try and limit my breadcrumb trail, so I can't really look backwards and say how long I've been here, or what may have gotten me here. IIRC, it was probably due to chasing articles on startups/entrepreneurship, as I seem to think that was over-represented in my early HN reading. But it's probably been about a decade, so take that with a grain of salt.
2. Many people have areas of interest outside of their profession.
(3 minutes of searching got me Con Kolivas, and "ck" sounds familiar so that might be him.)
edit: now I see heavyset_go has commented about the same.
I can't speak for the original poster but I think HN users are attracted to complexity and raw truth. Medicine and programming have a lot in common in that regard.
An example is the discovery and isolation of insulin [0]. Banting barely convinced somebody to give him lab space for 2 measly months. He then experimented with tying off the ducts of dog pancreases or removing the pancreases altogether. He realized he could keep a severely diabetic dog alive with injections from another dog's pancreatic juices. There was some drama around the subsequent purification of insulin and the Nobel Prize.
The full story almost sounds like software hacking and startup drama.
[0] https://www.sciencehistory.org/historical-profile/frederick-...