I think this person has a very narrow definition of database. Also it doesn't lie to you It attempts to give you an answer for your query. The problem is this person seems to believe that the only portion of the query that is relevant is the question they're asking. Who and why they are asking are just as important as what they are asking.

So when you understand that DNS, in many cases, evaluates not only the question but who asked it and why they asked it then it becomes clear why the answers can be different. All of those things are inputs into your query even when you do not understand all of the inputs. This is not lying to you. Because a lying is an intentional deception. This is simply DNS trying to answer the question in the best way possible to get you to the outcomes you want.

TFA reads like a person who's very close to learning about CAP theorem.