Especially in this case, because what changes was he trying to override? If it's all stuff related to the property and he wanted a more accurate portrayal then that's basically what was said just he went to a step above the showrunner.

If the showrunner wasn't listening to his critiques than I don't really blame him of he is that dedicated to the property, but without a clear paper trail it's impossible to know if it's because of general directional differences or if he was being an absolute dickhead about it.