I thought Nagasu has a stress fracture in her foot and has been off the ice for a few weeks. If so, she's got more immediate problems and things to worry about than not being invited to IMG events in Japan in the future. So far, she's still on the roster for GP events, the first of which is CoC in November.
I'm not sure about that. They say just "injury" and no idea how it's "serious". One thing true is that this is the 4th cancellation in one year. It surely affects her popularity in Japan.