Yes actually working as an in-house intern (no matter it is an audit / finance or IT audit) is surely a valuable experience as you will be serving them when you are working for Big4!

AIA is under the financial services sector, which may even help you to gain an advantage when you are applying to FS teams of Big4. If you are really exploring a direct advantage for your application to risk advisory, try to gain direct experience from this AIA IT Audit internship eg ask for engagement in related projects, or at least ask for learning on the internal procedures of conducting risk measures inside a corporate. That should help your interview, or at least you can share it on your CV with substances.