Primary position is in relation to the traffic stream. In a wide lane turning traffic (could just be the sole cyclist) forms a new traffic stream. The primary position in the left turning traffic stream is likely be about the same absolute position as the secondary position in the wide lane before the preparation for the junction starts. I would say the kid in the photo is in the primary position in relation to the straight thru traffic stream and should be more left forming a left turn traffic stream and taking the primary at that.
Primary position is in relation to the traffic stream. In a wide lane turning traffic (could just be the sole cyclist) forms a new traffic stream. The primary position in the left turning traffic stream is likely be about the same absolute position as the secondary position in the wide lane before the preparation for the junction starts. I would say the kid in the photo is in the primary position in relation to the straight thru traffic stream and should be more left forming a left turn traffic stream and taking the primary at that.