I will suggest that the bike in that video has a BAD alternator stator, inspite of what the author says. (You might look to see if he has another video?)You can check the stator wires easily enough with a ohm meter at the voltage regulator (VR) which is mounted up under the front left side the bike. Here is a video on how to check if the stator wires are good (earlier bike with VR mounted on rear fender).
He did not check ohms from the yellow wires to Ground. Any connection/continuity to Ground is BAD/Short circuited!
The AC voltage tests that he performed shows it. There should be ZERO voltage indicated between any of the 3 Yellows & Ground.
He should have tested AC Voltage between the 3 pairings of Yellow wires like he checked their ohms.
Looking for about 30 AC volts at/near idle and 40 AC volts or more @ 4000 rpm!
At least he started his testing at the Source, even if he got it wrong.