...All the tyre needs is heat. You dont have to 'scrub' the edges...
That is correct. While popular wisdom says "scrubbing" or "scuffing" the tire surface is necessary before full grip is available, that is wrong.
Also the common recommendation that residual mold release agent makes tires slippery is wrong. Tire manufacturers no longer use mold release agents on the tire tread portion.
And the common practice of weaving the bike the warm up tires is wrong. That does little to warm them up.
The truth is a new tire delivers essentially full grip as soon as it's within the operating temperature range. No break in procedure is needed.
All this is discussed by Pirelli's racing manager in this Sport Rider article: How To Properly Warm Up Your Tires - Sport Rider Magazine
So why did the guy in the previous video crash? Several possible reasons:
(1) The tires look shiny; it's possible someone mistakenly used Armor All or similar treatment on them.
(2) If the tires were recently changed (possible even on a new bike), the mounting lubricant can get on the tire surface.
(3) The parking lot surface could have had oil or anti-freeze on it.
My friend crashed in a gentle curve at about 5 mph because a wreck the previous day spilled ethylene glycol coolant on the road. He had fairly new Dunlop Qualifiers, but said it was like hitting ice. Ethylene glycol coolant can't easily be cleaned up, which is why it's not allowed on the race track.
Still it makes sense to take it easy when new tires are mounted. But not because the tires need "scrubbing in".
Rather, they probably feel different, so best to get accustomed to them gradually. Also the technician might have left residual mounting lubricant on them. Parking lots and areas adjacent to car washes often have slippery regions from engine coolant, oil, and flung-off tire dressing.
The best way to get tires prepped for a curve is a few hard acceleration and braking runs. That causes sidewall flex which heats up the tire. Frictional forces (weaving the bike) don't heat up the tire much.