I say that based on my personal experience:
A nurse in the clinic checked my BP (as a routine) when I went to get checked for some eye infection. And she was shocked that it was 170/100 (normal is 120/80).
It was shocking for her (and of course me) because: I was 25 I looked healthy and lean (not too thin). I showed/experienced no signs of hyper tension.
My eating habits, was to go on a Frozen Prepared Food diet (for lunch and dinner) because that was the cheapest tasty food I could afford along with cereals for breakfast, for about 3 months before my BP was checked.
I dropped this diet since that day, reduced salt intake considerably. And it took about 9 months for my BP to come down to normal levels, without any medication, and with a little extra exercising.
I'd have taken this article with a pinch of salt. But, I have cut down on salt intake. So I prefer to not take it :)