I think this is fantastic advice! As students from The Fieldcraft Course know, dry firing your weapons to develop muscle memory is important. It’s also important to function check your equipment to ensure it’s working properly before you leave the wire.
As students also learn, conducting Precombat Checks and Inspections is a very important small unit leadership task (gotta inspect what you expect). This would include conducting rehearsals in full gear so that everyone knows what to do when a particular time comes. For instance crossing a danger area or conducting a react to contact drill.
It also just so happens that the gentleman in the video giving such good advice also produces his own line of gear under the UW Gear brand. I haven’t personally used any, yet, but I know many people who personally have. If the guy sewing your chest rig knows this much about patrolling it’s bound to be good gear.