I don't want to get into a complication here, but I also ride Central Park. I'm not exactly sure where he hit the lady at but 4:30 is not a good time to ride in the park. It is realllly packed then and pedestrians (a lot of them tourist and do not understand our traffic patterns) will walk into the road and have no idea where the flow is coming from.
I usually ride slowish around the small loop until I head north past 72nd street. this is where it becomes a bit less crowded and you can open up, especially on the north end switchbacks and after the Harlem hill area their is a nice downhill bomb you can hit. But as far as south park area it is very crowded during the day. Most likely she stepped out and didn't see him. It's a 50-50 thing and may not even have happened at a light. A lot of the pedestrians just cross wherever the hell they want to!
Early morningish is the best time. I now live near Prospect Park and it's less crowded so easier to deal with.