So in essence that is actually one step MORE than using GLB to compile an iOS app in the first place
I think I'll stick with GLB 
No, in essence it's the same; and also different.
From what I understand, GLBasic compiles the BASIC code to some sort of C format (unusable at this point), which is then compiled by XCode, with a valid developer license. That's two steps to get to a functioning app.
The AppStudio compiles the BASIC code to some sort of JavaScript, which is a fully functioning, standalone WebApp, which can be sold without any developer license, independent of the AppStore. That's only one step.
If, for any reason, there is a need to sell these apps through Apple's AppStore, PhoneGap (using XCode) will re-compile it into a native-app format, with a valid developer license. That's the second step, for a second format.
But we're still only talking on the basis of app generation, and not the quality of the apps themselves. GLBasic is clearly a bonafide powerhouse, that can run circles around the likes of AppStudio, which is only a RAD tool. No contest!
That's why I'm sticking with GLBasic as well.