Concept of mean systemic filling pressure
You've misread the linked article if you take this to mean there is some place that is unaffected by cardiac activity. It's just that there must be some place that is equal in pressure to the MCFP. The actual position fluctuates throughout the cardiac cycle.
The reason, though, that some place must be equal to MCFP is that pressure is continuous. Somewhere in the vasculature (i.e. proximal arteries) is definitely greater than the mean; somewhere else (i.e. proximal veins) is definitely less than the mean. Because the pressure varies continuously the function must pass through the mean at some point along the vascular path. This isn't anything special about biology, just mathematics.