While I wouldn't use the tip's advice myself, the justification is valid, which is why languages like C# introduced the out and ref keywords for use at the call site.
The best argument I can come up for against it is this: instead of requiring people to use pointers, you should instead require that people write function names that reflect what the function does. When I call std::swap, I know it's going to change the value of the arguments because the name implies that. On the other hand, if I were to call a function getSize, I wouldn't expect that to modify any arguments.
