You're entitled to what's known as "like kind and quality" in the industry. Basically if what you had is no longer available, then it is something that is as similar to it as possible currently available.
A top of the line item from several years ago does not mean you get current model top of the line camera back. With most tech related items, today's new exclusive features usually end up being tomorrow's mid-range features. For a camera, as long as you're getting a similar (not exact, as it's not always possible) feature set, then I'd consider it fair.
I'd consider the flip out screen to be a pretty important function to have. When the A80/A95 first came out, it was pretty much the difference between those and the A70/75. Logically you'd look for a Powershot with the same type of LCD. However, all that being said, bear in mind that with something like the A650 you are also getting a host of things (like IS, increased zoom factor, increased MP count, bigger LCD etc) that the A95 didn't have. So there are some trade-offs there to think of when considering what is "like kind and quality".
As a camera guy and former insurance adjuster I can see it from both perspectives. I can't really say who is right, because there are strong arguments for both sides. Howver, I do hope that what I said will help you in deciding whether or not you got what you are entitled to.