I've been to a lake in SoCal where giants hang out at the marina dock by the ramp like that. We were looking at several fish in the 10-15 lb class just cruising around. They aren't dumb, they are living right next to where they come and stock the trout.
Looked to see what lake he caught that on but didn't find it. Most lakes in So Cal they do not allow fishing near the dock. That's why the giants hang out there. They didn't get to be giants being dumb.