"...the very few activist bloggers would be able to get their information out, maybe, but not the average Jo. It's genuinely possible that the average Wuhan resident hasn't tried to access anything except WeChat and gov approved sites the last 3 weeks..." - most Chinese don't care about accessing Facebook or other banned sites. They are quite happy with their "intranet". Those who care have figured out their way around the Wall.
"...I seriously can’t imagine how awful it is to be living in Wuhan now..." - I have a friend who lives in the center of Wuhan. She is in good spirit, goes to work every day (office job for the government making payments to handicapped) and no food shortage. Getting "dressed up" for work is a bit of a pain but she is not complaining.