The video quality is too smooth even for component cables. You would still have evidence of video noise in the analog to digital conversion. There is none present. The 16-235 YUV levels are ignored.

Audio: There is no audio buzzing which would also somewhat be apparent in the audio due to being captured with the white and red audio plugs. Example:

Real run (check 7 seconds loading screen when no game audio is present):

Then check 1st place at 18 seconds... no buzzing:

His accuracy on average is 10% higher than everyone else who did a run...

They most likely played on PCSX2 Tool assist fashion with save states to emulate a "very good run". This explains why the video and audio quality has no analog to digital imperfections and why the accuracy is so much higher.