2x 72 hour transit allowed? (additional clarification needed)

Leeds from USA kindly replied to my previous question whether a 72 hour transit in Guangzhou would be allowed on the following route: AMS-PEK(72h)-CAN(3h)-SYD

Leeds said the route is not qualified because I stop over in two Chinese cities.

I'm a bit puzzled because in (2) in the Conditions for Application it says "The flights to and from any of the eighteen cities should not stop BEFOREHAND in any other Chinese cities".
In my case, I have a stopover (and not leaving the airport) AFTER the desired 72 hours in Beijing.
Have I interpreted this incorrectly or does it mean that the 72 hour visit should be the ONLY stop between 2 other countries?

Thanks in advance for the additional clarification!
Mark