Normally, there are no restrictions for aircraft’s innocent passage through another country’s EEZ.
There are no restrictions at all according to the UN. It literally points back to the high seas section. Am I missing something? Can you point to the specific section in the UN charter that contradicts article 58?
The term "innocent passage" only appears in the territorial waters section, not the EEZ section.
Also, if the aircraft actually breached some airspace, escort them out and file a report, like the Baltics do with the Russians all the time. That's the professional way to do it.
Also, is there another source where it says they were in China's EEZ? This article says they were near SK, which would suppose a SK EEZ, but they don't say exactly.