We can't "prove" that the "Chinese" money was spent on these ads AND ONLY ON THESE ADS.

The Chamber of Commerce is apparently claiming that The Chinese are perhaps just paying the salaries of the people making the ad buys or for coffee for the techs who fix the computers of those who make the ad buys. Or people to answer the phone when people call to complain about the ad buys or lawyers to defend the ad buys in court. You get the picture?