He said he was disappointed by Cathay 15 years ago, so he was very likely to have a negative perception of Cathay before boarding the flight.
Human can be consciously or unconsciously biased, which is what I felt from this video.
That said, HKG-TYO is already one of the better served routes in Cathay's network - other flights (e.g. ex KA routes) could be worse.
The only major poor showing was the meal.

I don't understand why announcement in multiple languages could be criticised.