Well, it's open source, so he volunteers his time. Maybe the feedback should have been filled to Github in the first place? Certainly he is not lazy if asking to do a favor but probably busy with something else.
Sure, but if time is of such importance here, copy+pasting the feedback into a new issue is faster than replying to the author and ask them to file the issue. Then it might be that they don't because of X, so you have to file it yourself anyways.
In both scenarios, just filling the issue yourself is faster
In both scenarios, just filling the issue yourself is faster