Seems to just take up the slack of the rod moving on the pin. I wouldn't expect it to impede the rotation of the Wastegate arm.
These clips are an official Audi fix under TIS. Yet to find anything similar from BMW though...
2008 E90 335i LCI M Sport / Manual / Black / Red Leather / Avon ZZ3 / VMR710
Mods: JB4 / BMS DCI /AR Design DPs / ETS FMIC / Water Meth Injection / Spec Stage 2+ Clutch / BMS Chargepipe / BMS OCC / Cool Carbon Brake Pads / Rob Beck PCV Valve / Forge Diverter Valves
Wish List: LSD / Bastuck Quads / Birds Suspension / M3 Arms