I thought this was an interesting test and the results were a bit surprising. The DA used in the test looked like a Zentool 21 (similar to a Rupes 21), which is a large-stroke DA with a 21mm orbit. The rotary appears to be a Rupes Rotary set between speeds 2-3 (which should be 800-900 rpm).
If the rotary speed was set higher (1200 rpm), the results may have been a bit different. In my experience, I rarely exceed speed 3.5 (out of 6) on my large-stroke DA for any correction or finishing work; it can deliver results similar to running a rotary at 1200 rpm.
Point is: DA's (forced or large-stroke) are not necessarily safer than a rotary.