There are two allowable basic Chinese routings for entering China from SARIN to ZSPD, and there is no flexibility with these. About the only time these are changed are via a Mid Cycle NOTAM, or a day-of NOTAM closing airspace, usually for day-of Military Opns, which probably happened here. In China, youre either on the airway centerline, or a radar vectored offset, or you’re in prohibited military airspace.
An example of one of their NOTAMs redirecting an airway…
