Answer:
That statement is false.
Step-by-step explanation:
If done properly, analyzing your audience demographic could make your marketing campaign become much more efficient.
Example of this would be when the marketing team are targeting different economic demographic.
Whether we want to admit it or not, the way people in upper income bracket spend their money is significantly different than the way people in lower income bracket spend theirs.
Analyzing your audience demographic, could identify these groups and design their products in different ways to cater to different economic groups (People in lower income group tend to see how much value they can get from the product. People in higher income group on the other hand, have more consideration over trend and prestige)