It probably does violate standing diplomatic agreements with the PRC over how that sort of thing would be handled. There was a lot of pushback in Taiwan because they saw it (correctly) as pointless pot-stirring.

Anyway, I think most of the flights that aren't innocuous (and many of them are or they wouldn't need to have such bullshit articles) are drills in preparation for the possibility of the US using Taiwan as a military platform as it has been angling for in the past. They aren't just dick swinging or whatever, China doesn't want to take any risks in the event of a military conflict, though it would prefer such a conflict not take place.