OK, I'll try to stay on point, it's just been fun so far.
Here's some of my thoughts:
I doubt you will find many Porsche owners that have tried this process since Porsche says our coolant is good for the lifetime of the car.
Water pumps fail sometime between 75K and 125K, change the coolant then.
I doubt this process will remove even 2/3 of the coolant.
The level of vacuum used in this process may temporarily collapse most of the radiator and heater hoses.
BTW I used to be an INDY.