Yes it is confusing, however quite correct. Actual FLOPs (as opposed to theoretical FLOPs) is a measurement of math work completed per unit of time (measured in seconds, but not for A second). Unlike theoretical FLOPs, it's a snapshot, and depending at what point you take this 'snapshot' it can range from theoretical FLOPs (Max) to 0 FLOPs (i.e. start/end period=single memory read operation with no calculation). System FLOPs should be determined within a period of time that encompases atleast one cycle of all applied operations (such as copy, calculate etc.), with a better approximation at T approaches infinity.
What a load of pointless waffle!