[Steve Van Doorn]

said, "Salt restriction doesn’t seem to help change the blood pressures changes"

Yes, but salt is what our brains use to open the synapse of our brain.
What is the objective?

[Steve Van Doorn]

Deficient Iodine found in table salt might be causing thyroid enlargement in their children. This causes all kinds of problems including allergies.

[alexander_busek]

Yes, but salt is what our brains use to open the synapse of our brain.

It's all about the dosage. Many substances that are essential to life can, nonetheless, impair health or even prove fatal if ingested in excessive quantities.

What is the objective?

Unclear what you are asking. Are you asking: By what mechanism could reducing sodium intake possibly reduce blood pressure?

Regards,