Doesn't change the point. All of the fork's 55 PRs except 2
and most of the issues were made by the forker himself as well.
It's not like the forker inherited all the open issues/PRs, they just dropped them all.
Getting popular and having the masses leave a bunch of issues/PRs is hard. Reviewing code is hard and takes more expertise than writing it. A lot harder than reviewing your own PRs on a motivated (for now) fork.