Mistitled though. He doesn't show how to use a marking gauge "correctly" he just shows how he personally uses one and takes about 12 minutes too long in the process. He gets basics wrong - somehow nobody has ever showed him why a marking gauge should be pushed rather than pulled.
These gauges are pulled. He's holding the gauge at fingertips, though (ouch), whereas they work well held almost like a suitcase handle with the thumb past the fence bearing down on the beam.
Some folks on here with the veritas or titemark gauge are going to go out and try to push it and wonder if you're making an attempt at humor - or wonder why you consider something applicable to pin gauges (though it's confusing as to why pushing those is "right" - they work the same either way) will be the same for wheels.