The article linked above has a link to the original study, which is available in its entirety.
https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2850241?guestAccessKey=d13423b6-0f97-447a-a381-df38354146d7
The conclusion shows some nuance, re: all cause mortality and major cardiac events:
Conclusions
In this nationwide cohort study of veterans, the 2024-2025 COVID-19 vaccine was associated with a lower risk of COVID19–associated MACE; absolute risk reductions were generally modest, but more pronounced in older adults and individuals with comorbidities. Effectiveness extends to broader outcomes (all-cause MACE, hospitalization, and death), likely reflecting the hidden burden of undetected SARS-CoV-2 and associated complications that are reduced by COVID-19 vaccination. These findings provide timely evidence to help inform clinical and public health discussions about the role of updated COVID-19 vaccines in the current epidemiologic context.
If I'm reading this correctly, they appear to be saying that the protective effect extends to cardiac events, morbidity, etc, that are the result of undetected Covid infection, not necessarily to heart disease in general or other conditions unrelated to Covid.
Take a look and let me know if I'm mistaken.
Disclaimer: I am fully vaxxed and up to date, and will continue to do so.
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