The test was bogus
Scientific research shows that cleats or "clipping in" add only 20% to the complete pedal stroke. You can not "pull up". Cleats only allow the foot to start adding power slightly before the downstroke and then extend it slightly after. This helps cover the dead areas at the top and bottom.
If you watch the video the cyclist is still wearing cycling shoes and actually has a block of some sort, so effectively, when on the "flat" pedals he's actually still gaining much of the benefit from the cleats.
If you really wanted a comparison, he should have been wearing conventional footwear. Much of the benefit of clip less pedals is the shoe and the long term benefits they provide in terms of comfort.
Plus, the test did not simulate any real world cycling scenarios. No accelerations, no attacks, no 50 mph descents.
Lifetime I have well over 100,000 miles ridden on a bike "clipped in" they are simple to get In and out of and I have never fallen because I could not get a foot out in time. I first tried them in 1987 and they we're such an improvement over my old cycling shoes with pedals and toe clips.