The article does apparently only talk about attack rate efficacy/effectiveness. What is much more important in a population with high vaccination rates is the reduction of hospitalization and mortality which is much more long lasting with the vaccines.
The article does talk about mortality rates quite extensively, immediately after the first section about infection rates.
Starting sentence for that 2nd section is
> The three vaccines held up better in their ability to prevent COVID-19 deaths..
You will find the changes in two age groups, above and below 65. Modena and Pfizer/BioNTech again much better than J&J, albeit still showing a significant decline in the ability to prevent death.
Edit: here are the graphs for mortality from the study: https://www.science.org/doi/10.1126/science.abm0620#F3