This has been evident for some time now. UK data has indicated it for months and they have tried to obfuscate it and hand-wave it away.

Even the efficacy "curves" for Delta (from the Denmark paper), if extended beyond the 150 days range, would eventually go negative (power curves, essentially). It just happens a lot quicker with Omicron; clear evidence that the virus has exploited the ill-considered brain dead approach of using a narrow spectrum antigen "vaccine" to create a large uniform playground for variants to evolve.