JWGRAY comments

He is not entering the country for sightseeing. A tourist visa is for tourism and vacation. He is entering the country for purposes of his work. He is planning to consult with business associates and or negotiate a contract. In such circumstances a tourist visa is not an appropriate description of his activities while in the country.

If you are highly skilled why would you choose Japan when there are so many better choices to immigrate to?

China has everything to lose by not continuing their drive by assaults on the statusquo. The whole idea is to wedge into the status of a given territory and each time they drive by they feel it is pushing the wedge in further giving them a greater claim. It is not.