What this study finds is exactly what vaccine developer Geert Vanden Bossche (Belgium) has been predicting. The predominance of antibody-resistant SARS-CoV-2 variants in vaccine breakthrough cases from the San Francisco Bay Area, California. 
The California study finds that vaccinated individuals are more susceptible to COVID variant infections than unvaccinated. Geer Vanden Bossche has been warning that vaccine antibodies would suppress natural antibody responses. The vaccine antibodies take control of the immune system and defend only against a targeted virus.
Among vaccinated individuals, a COVID variant virus is not recognized by the specialized antibodies provided by the vaccine, and the natural antibodies have been programmed to stand down.