The article shows one query generator which generates SQL which are logically equivalent to the hand written SQL, and compares it to another tool which generate

The article shows one query generator which generates SQL which are logically equivalent to the hand written SQL, and compares it to another tool which generate inefficient queries. So it is not an inherent problem with generated SQL, just with some particular tool. So...use the right tool? GraphQL allows you to specify what data you need. Obviously, if you use some middleware which throws this information away and just fetches everything from the database, then you have an inefficient system. But this is not a problem inherent to GraphQL or generated SQL in general.