What's not really true in that article:
"the Dynamic Compression Ratio, is fixed when the engine is built and never changes during the operation of the engine"
Yes, the calculation never changes, but it completely ignores the fact that the DCR's percentage of actual cylinder pressure in the effective torque band ranges from 90% effective (very small cam with early IVC, low speed engine, low static CR) down to under 45% effective (late IVC, high speed engine, high static CR).
The DCR prediction can and will show the same figure for both of these engines - which one has the higher cylinder pressure at speed?
DCR ceases to have any meaning during the RPM range where the engine produces serious power - regardless of how much power.