I wonder if what he says can be a bit ambiguous
It could be that he means the turn from that base leg to final is overshot or late with respect to the base leg (i.e. crossing the extended centreline), compared to others, or he might mean that others are already established on approach from a final turn a bit further out.
I'm not sure what help there is in the close ups of tracks of right hand circuits on other flights
Most witnesses to most things say things they havent actually seen and dont mention things that they have seen.
RE: the famous gorilla in the room experiment.
And unless you are a pilot most lay witnesses have no real idea what a plane is actually doing