I assume they meant they were hashing the response rather than hashing the request. Then you don't have to keep the entire response around for comparison, only its hash.
I think mhb's point is that the size of the request content is so small, it can be compared byte-for-byte directly instead of hashing and comparing hashes. Many of us have a kind of muscle memory where we always hash everything for comparison, but for small data there is not really a point.
