It depends on the property. If a Diamond leaves noteworthy comments on the survey (positive or negative), the property will typically provide a personalized response. Usually the response will come from low to mid-level front desk staff, but that can vary based on property and the nature of the comment. IME, the GM is more likely to respond if you've left positive comments

Some properties don't send surveys and IME those are often the properties where feedback would be most appropriate.