Must be some pretty weird science, if...
...they consider the Japanese to be lazy or disorganised. (No offence to any Japanese people, but I don't really feel I know enough about them to comment on the other three supposed characteristics. But definitely, lazy and disorganised? I think not.)
I've cracked it!
Here's my theory: people are basically the same, but cultures are different. These are self reported so the same behaviours would feel very different.
Eg. Assume there is an etiquette rule in Japan that you must return phone calls immediately you get the message (I don't think there is such a rule), then if a Japanese person gets a message but doesn't return it for hours, telling the caller they just got the message then they might label themselves "rude", meanwhile an American might delete a voicemail without listening to it because "who leaves a voicemail?", and still mark themselves in a study as extremely polite.
The politer and more organised the society, the ruder and more disorganised individuals who know nothing else will feel.