It occasionally happens that conventional science in a particular field is forced to revise its beliefs due to new evidence. However, when that happens, the majority of trained and competent scientists go along with the new evidence. This is the nature of science, its not an argument against the consensus scientific opinion. A little while back my blood pressure was found unexpectedly high for my age, height and weight. Not enough for medication but enough for regular monitoring: blood pressure can vary significantly over a week or even a day. Six months of frequent monitoring and I had found that blood pressure varies with my weight - losing 6lbs brought it into the ideal range, well away from the borderline. In that time I exercised a bit more and cut down heavily on bread.
Perlmutter is a quack, and both he and DiNicolantonio are all-or-nothing "thinkers." Read this: https://www.health.harvard.edu/heart-health/salt-sensitivity-sorting-out-the-science#:~:text=About a third of people,lower when they eat salt.