Are you sure your diet didn’t include either a separate, unnoted “reduction”, or an increase in something else to help?
I don’t believe alot of hogwash about what we should or shouldn’t eat. Many things have pros and cons and in the end, it doesn’t matter. It all evens out.
Salt was the only thing I changed.
I’ve kept it very low ever since and the doctor this year told me to start eating more since my sodium was low.
My blood pressure has remained about the same for the last 35 years, 130/70.