I don't know why you got downvoted but I do know I like salt and I often run into places that don't put enough of it. Whether it's important for pasta or not I really don't know but it's easy to believe it would be better with than without. Also, adding salt after cooking doesn't taste the same as adding it during cooking (again, in general, not specifically for pasta). My go to example for that would be scrambled eggs. Salted before cooked they taste great. Salted after they taste like bland eggs with salt added on top.

The parent says that no matter what you do, if you don't add salt you can't have a good pasta dish, not that it tastes better with salt.

I'm saying that yes, you can have a good pasta dish without salt, not that it doesn't taste better with salt.