Would need more data to properly assess PIO/APC
To conclusively determine if there is any evidence of PIO/APC, one would need much more data. Depending on the sample rate available, and parameters recorded, it some times is even difficult to make these judgments for certain from an FDR or QAR. The PSD of the 3 axis time history of the wind and gust environment also needs to be established, along with the related amplitude and phase angle of the control inputs. In flight test, very high data sample rates are typically used, as well as external sensing of the atmosphere, to be able to definitively tell what's appropriate control system response, and appropriate pilot response, and what component is potentially PIO/APC. At this point all one can reasonably conclude about this KLM landing is that the pilots landed successfully, in a challenging environment, and the B777 is [arguably] a pretty great jet in very tough WX circumstances. I've seen this all first hand for decades, in these kinds of jets ranging from RA001 to WA001 and all their later kin, and cousins (including even Airbusses), ...and the B777 stands out as remarkable in its ability to reliably handle very tough WX.