Well if you do that then don't call it fasting. It is fasting, but saying you're doing "X fasting" method implies you think there are benefits to it - which there aren't. It's the same as if you ate 20 small meals every 30 minutes - the macros count.
I think idiots will take IIFYM to mean "ye brah, i'm at maccy d's all day son". People with some intelligence will realise it just means eat whenever the **** you want, hitting good amout of fiber and fruit/veg and then just eat whatever to fit your macros.
Fasting to me just seems like a really good way to **** up your eating habits. It works the same way IIFYM works, but there is nothing special about it. It's still flexible dieting if you eat in a 5 hour period because that's flexible for you.