The linked post about his treatment is basically a vanity article; low in useful information, but high in vague assertions and platitudes. There's also a link to a post griping about the red tape someone experienced while trying to self-treat their dog's cancer that's weird. I clearly live in a different world than these people.
Here is a video if you want more detail.
https://forum.openai.com/public/videos/event-replay-from-ter...
"Event Replay: From Terminal to Turnaround: How GitLab’s Co-Founder Leveraged ChatGPT in His Cancer Fight"
This is a common trope in the tech field- successful tech person who is good at tech gets disease and wants to help cure it. It's easy to generate a lot of data these days (whole genome sequencing, various tests) but the reality is that turning that data into actionable knowledge is remarkably difficult.
Much of the red tape exists to help people avoid making common mistakes that aren't obvious until you've been through the process a number of times (other red tape just exists to gatekeep unnecessarily).