That's how I read it. "...all iPhones since the iPhone 4..." are vulnerable.
This is what I found, buried in the link.
“The bug affected iPhone 5 and later, iPad 4th generation and later, and iPod touch 6th generation and later.”
So I reckon his is okay, which is good, since he’s still pissed off about the iOS 6 update which ‘messed up’ his phone and I don’t want to have to argue him into updating it ever again.
My crappy old iPad 2 is not on the list, either, I see.