While you may be offended by it, this article didn't invent that ratio. It's been around for years, as far as I can tell. I'm not certain where it came from, but it's pretty normal to use grams per pound when discussing protein intake in the US.
I'd argue it would be better described as 1 gram protein to 500gm (half a kilo) of body mass. That's actually a ratio, in the sense it can then be written simply as 1:500.
You could translate that to US imperial as the ratio 0.032:16 -- assuming ounces all the way down, of course. Convenient!
Microbloits to the parsec, football fields to the ocean, grams to the pound -- these are all just whacky to most people.