It's worth noting that if you lower the provincial loyalty to something like -1 or -2 for all provinces, the AI will likely sit there and not attack for years. This needs to be done in combination with giving them more money for best results.
I assume this sentence is backwards in some way. The higher number means they are more rebellious and the AI will sit there, I realized I had upped rebelliousness by +2 on every province, I bet this is a problem. Going to test without that now.