That website has some truth to engine break in but it still a bit lacking in distinguishing what it is that causes ring seating....It would be a mistake to take an engine and start mindlessly pinning the throttle...
RPM doesn't seat the rings...It's gas pressure that seats the rings...Gas pressure gets behind the ring and expands it outward toward the cylinder wall creating a seal...The only way to get maximum gas pressure is full throttle...Adding maximum gas pressure on rings early helps ensure that the ring will take the shape of the cylinder early on....If the rings get broken in without taking as much shape of the cylinder as possible then you can possibly get an inadequate ring seal.
This doesn't mean just mindlessly pegging the throttle and screaming the engine...You could end up with a prematurely worn out engine and possible engine damage.
It means brief full throttle spurts with a load on the engine...Which means getting on the gas and off the gas before the rpms get too high...You can do this without ever climbing past the mid rpm level....Just do some brief full throttle a few times and make your riding time going from acceleration and deceleration varying throttle inputs in about four or five 10 to 15 minute riding sessions with a complete cool down between rides... Keep the rpms moderate but be adding throttle or letting off....The easiest way to do this is make your own little track (imaginery if you have to) with short straights and lots of turns...That'll keep you from constant throttle which is what you want to avoid...Avoid constant throttle and high RPM...Remember it's gas pressure that seats the rings and not rpm...The rings should be broken in in about an hours riding time...Always allow the engine to warm up completely before any heavy throttle is used.