I watched the video a little closer, and noticed that's the cycle that ended with the "H" and "M" on the display and flashing lights (not shown) that aren't supposed to happen. I joked in a previous thread that H M means Help Me, after suffering through Bob-loads. I don't know what it means. Maybe Hot Motor? There's a fault code (on GWL08, and I assume successive models) for "hot tub" if a cycle ends without a proper cold rinse, but that load did rinse. IWL12 has a menu selection in diagnostic mode for Hot Tub, but I don't know what it does.
Jason, performance should be equivalent, except for any advantages on cycle options. IWL12 is more versatile for cycle options and adjustments, and has the programmed LifeCycles that can do temp combos and cycle sequences that aren't possible on the GWL11 except by button-pushing. Or not at all in some cases, such as the Sport/Muddy cycle that runs two deep rinses with (I think) a spin with sprays before both rinses, the 2nd deep rinse having a longer agitation than usual, and sprays in the final spin (I've not seen sprays in the final spin except on Muddy). GWL11 doesn't have the display to check RPMs in diagnostic mode, the actual and target temp for the mixing chamber, etc. (GWL11 does have a diagnostic mode, but no alphanumeric display.) The other main difference is IWL12 has the fabric sensing feature to automatically determine agitation action, GWL11 does not.