It’s about fat that’s been laid down in the body as a result of excess calories, not about the fat that you eat (unless, of course, you eat so much that that is converted to body fat too).
Oh, and a lot of studies (can’t speak for what Moseley may be using as source material) don’t distinguish between good and bad cholesterol, so can be misleading.
It’s a huge myth – just like the ‘don’t lose weight quickly’ thing. That said, it’s still better to eat some fats over others, but those naturally occurring aren’t the problem (even from animals) – it’s the artificial or trans fats that cause the problems, and these are being phased out/banned on an increased basis.
Hope this makes sense – I’m writing in a rush 🙂