Correct the assumption and give specific feedback. Say what's untrue and what's true instead.
Specific feedback works far better than asking for something better. For example:
"This assumes she is a beginner; she already has an established business."
"Keep the argument, but use the client example I gave you."
If the whole direction is wrong, say so rather than polishing a draft that doesn't fit.
If a Foundation insight is wrong, correct it in that Foundation studio, so the fix carries across every Studio.