The difference between BDSM and what’s portrayed in ‘50 Shades of Grey.’
The article is awfully vague about how the book violates BDSM principles. For a better summary, I highly recommend The Pervocracy's read-through.
To me the big question is - Are the sex scenes less reality-based than what you find in any other bog standard bodice ripper or modern western?
I’m going to say No. Because the only way that would be possible is if you replaced the characters’ genitals with gardening tools and had them speak Dolphin.