That would be the wrong interpretation. I believe paragraph is meant to address customers who purchase a subscription for a RHEL product, let that subscription expire and keep the system running RHEL and then start a second subscription to start up a second RHEL product instance. On and on such that they have many RHEL instances in service but are only paying subscriptions on a few of them. Even versions that have been manually manipulated to hide the fact that it was a RHEL product installation. You can easily replace small portions of the system software on a running RHEL system such that no trace of the Red Hat protected marks are present on the system and still be using nearly entirely the executable code as built and certified by Red Hat.
Basically the idea is.. if you are going to install RHEL then the deal is you will be paying subscriptions for all the RHEL you run in-house. If you decide the subscription isn't a good value, then you can stop paying it and still run the RHEL system..but you have to stop paying it for _all_ the RHEL systems you have. You can't drop half your system...its all systems or none...no in-between. In for a penny, in for a pound.
I do not believe that the clause is intended to nor can be can be used to enforce payment to count CentOS or Scientific installs..or even Oracle installs. None of these are Red Hat branded products at any point. None of these products were ever eligible for services from Red Hat under the service agreement. They are distinctly different products from distinctly different vendors.