the malik's base has marg in
Does it? How do you know that then?
We know (or at least should know) that BIRs generally use some cheap, convenient container to put totally unrelated ingredients in.
The fact remains that butter ghee is bloody expensive, olive oil is bloody expensive, butter is bloody expensive, vegetable ghee is pretty expensive, marge is pretty expensive...compared to common all garden vegetable oil (which is getting there!).
This fact (together with the lack of concrete reports to the contrary) pursuades me that the use of any of these ingredients, in a curry base, would be infrequent.
Unless anyone else knows (factually) otherwise of course?