you're right EGQL1964, the centripetal effect might be tiny in this situation. The main thing here is that once the air parcel gets closer to the low (or further from the high) the centrifugal (which is not even shown in OPs pictures) and coreolis effects will lessen, but the pressure gradient force will still remain strong. Thus your parcel starts to deflect towards the center of the low (or "left" as the OP puts it)