I guess what I was trying to say that Excel as commonly known, is a programming environment, rather than a language. Where you can use the "Excel" programming language for performing most (if not all) tasks a general purpose programming language can.
But it's still a bit like saying "Eclipse" is a programming language. You can do programming in Eclipse, that is true, but you can also do other things that are not programming, which makes Eclipse a programming environment. Just like with Excel.
I don't think this is a true dividing line for a programming language. The Smalltalk language for instance combines both the programming environment and the language together. I don't think anyone seriously argues that smalltalk is not a programming language.
Seems like equivocation — Smalltalk is a programming language when we're using "Smalltalk" to mean Smalltalk the programming language and Smalltalk is a programming environment when we're using "Smalltalk" to mean Smalltalk the programming environment.
But it's still a bit like saying "Eclipse" is a programming language. You can do programming in Eclipse, that is true, but you can also do other things that are not programming, which makes Eclipse a programming environment. Just like with Excel.