I wish more people that wrote articles like this would actually footnote them so you can see where they get their facts and figures from. because a lot of people on the Internet pull out numbers from the rear end and nobody checks them.
I was a bit skeptical of the "less than 2%" figures So I did some research. I did in fact find out where he got that number from and apparently it's accurate
http://ajcn.nutrition.org/content/96/3/647.long
"Overall, <2% of US adults and ∼5% of US men consumed ≥4700 mg K/d (ie, met recommendations for potassium)."