Just to confirm, the climber here is working the 5.6 undercling and the 5.4 flakes are the bulge to his right. Is that correct?

Yes. You are correct. Sixish was my first Gunks lead. Misread guide book and ended up dealing with the block. My daughter with little trad experience was my partner that day. She got a little overwhelmed by the first pitch and there were a few tears at the first belay. But she rallied nicely and we ended up having a great time. Great climb. There is a lot to it.