A structure like that would be for fine tuning a filter's frequency, bandpass, matching, etc. It might compensate for tolerances in the PCB fabrication, or variations in device impedance.
I think you'd want to run a full E&M sim on it, just to be sure. The range of effects it can have is quite broad (its position varies by electrical angle along the transmission line structures, as well as contributing loading impedance with those isolated chits, which are at some distance as well, so will affect the response in a complicated way again).
Tim