@leaverou That's the missing part in your initial screenshot: yes, that have changed ~10k lines at once, but they did so in 14 commits. And it's possible they didn't realize that something that would be a routine review in a better-designed system is intractable in Github's.
(Full disclosure: I left Froogle2 years ago, don't know the author of the PR nor their team. And again I don't understand the last part of their email. I'm just trying to offer perspective in the hope of collaboration.)