Sorry, I didn't realize you were a blind developer, so my "I can't believe you didn't see it, just click the number" comment was unfitting. I'm glad that the Members tab is helpful.
Ah, I only read the part I quoted, so I didn't realize that. No wonder I got downvoted.
I know GitHub has at least some considerations because if you press tab, it shows a hidden "Skip to content" button (which I thought was a bug, but learned it's for screen readers). But I can tell the Network tab doesn't look as reader friendly as the Members tab because it uses some non-standard canvas element or so.