* non-procedural programming;
* unstructured programming;
Putting "non" or "un" in front of existing ways of programming only describes what this form is not, not what it is. You could go on and say: "not object oriented", "not flow-based" and "not the real linear" :)
* linear code
Code is the result of coding, also programming. So linear code is the result of linear programming, and we already know that's not what this is.
* spaghetti code?
Not really. Spaghetti code that is unreadable, and of which you can't understand the logic unless you go step by step and see what it really does. All code with goto LABEL or goto EXPR is spaghetti code, but obfuscations are too.