If they did, we wouldn't have to rely on random issues on random repos.
From the page you linked: Issue 789719, that’s why.
I don't get it... The latest issue I see there is #289797. Even if #789719 was a typo, I'm logged in but still getting a 404 for #289719. Maybe that's a private issue visible to you? Or your point is the sheer number of issues?