I found the drummers interesting. The snare drummers used a style I associate more with the Royal Marines than Army units. Perhaps of 50 years, the army has changed. It could also be a "parade" style rather than a "marching " style. I have witnessed a few Highland regiment performances when they toured Michigan. Also lots of other You Tube videos and I don't remember that as an Army Style.
I'm only a casual observer of Highland dancing. My impression is that it is very style bound with strict form requirements i.e. that's the way it's done and has been done for years. I wouldn't expect much variation from current performances.
One also wonders under the current state ( past 10 years) of Presidential security, would edged weapons be allowed that close to POTUS? Performance or not.