So that we are on a same page, you are stating that any company is de-factor to be considered belonging to country X if: 1) Founder has a double citizenship 2) Has some of the staff in a foreign country 3) Has a sales office in their home country

Is above what you are trying to say?

In this case, the sales office is their main office, and the Chinese "subsidiary" is where the main body of the company really is.