The tech had no reason to be anywhere near the water pump. It is possible that the dealer replaced the pump free of labor costs to keep a valued customer happy. I would not view it as an admission of fault. I think any thoughtful person would understand why you would question the timing of the pump having problems given your circumstance.
But, if was bad and showed evidence (sound and visual) of being bad, why didn't they see/hear it and tell him about when he went to pick it up??? Do they wear blinders and ear plugs when working on vehicles? This would be an obvious find that even Ray Charles could have seen and heard.
06 GCO, Dk Khaki, QDII, Flshing Hi 3rd Bk Lt, MDS "ON" Lt, Airtab Vortex Gens, Debadged, Fumoto Drain Valve, BT Catch Can, Chopped EGR Tube, SRT8 CAI, K&N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tune App, DS Tuner, Cust tubular hdrs w/3 in Magnaflow/Xlerator AP Exh Sys, Bilsteins, SRT Springs/Sways, Cust Eng Cvr, SRT8 frt/rear bumpers, FRI Sidewinder Cam/6.1 valvetrain, SLP 25% UD Pulley, BBK true 90mm T-Body, SOS Ign Coils w/.060 spark plug gaps, SRT Reps with 265/45&295/40X20's.