Here is the official statement from Chinese coast guard website about the incident.
It's just standard diplomatic language saying Chinese did nothing wrong. It was all professional and lawful, an expected statement to counter against Philippine narrative. I don't see any underhanded effort of attributing blames.
As to why 164 was involved, maybe the Chinese coast guard cutter (based on type 056) might not have the necessary persistent speed or acceleration to match the Philippine cutter.
Here is the English version published on the PLA official website for the those who can't read Chinese.