I say BS on the no hammer method. I takes very little heat to warp a panel. 48" at 2.5 minutes is 3 seconds. If you have ever TIG welded that is a pretty fast feed rate. The most important part of welding sheetmetal is cooling your panel. The more heat you put in the panel the more you have to fix. Plus how many sheetmetal panels on a car are 16 gauge? Most are 18-20 gauge. 18 gauge is .045 and 16 Gauge is .065. I doubt you could fully penetrate and .065 panel with a fusion weld that was not thin.
I got it maybe this weld was done under water. There we go, under water TIG welding will help control distortion.
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