Reality (LCPS) defeated the model (RIVM) big time for the prediction made on Dec. 21, 2021, probably because the RIVM did account for higher Omicron transmissibility but not for lower virulence.
For a total of six scenarios (RIVM predictions of Intensive Care (IC) daily admissions) data was collected. Graphs for all scenarios is shown below.
The sources (incl. Julia code and plots) are available: rivm_estimates_vs_reality.zip