Surveillance of some area in the Hawaiian Islands is obviously of interest to the source of the trans-Pacific balloons as are areas on the North American continent. The maneuver of the sharp turn north towards Alaska proves a sophisticated navigational capability of these balloons and argues against the traditional analysis that they are simply slaves to wind patterns.
There is nothing to say a balloon needs to be launched from China to be Chinese. They could be launched from a boat of any size, or brought into another country and launched there.