The fact that I can navigate HN does not mean that it is pleasurable. The front page makes cumbersome to navigate down the list of publications and the comments sections do not signal where a thread starts or ends and who is answering to whom. Skipping boring threads therefore becomes practically impossible unless I find the top comment and know the uncommunicated feature to collapse threads.
Presumably, he's able to navigate HN since that's how we met.
I'm visually impaired but not blind. I have no problems navigating HN.
You are welcome to join the group and ask how other members navigate HN. Most of them joined via links found on HN.
https://groups.google.com/g/blind-dev-works