In Spanish: word -> sound (is straightforward). sound -> word (not so straightforward).

So, spelling does make sense, but it's not much of a thing like in English. We have some rules to aid the process, but at the end of the day, you need to have read a lot to know how truly write a word.

That being said, I find kind of weird the cue process described in the article. I think that in Spanish we always learn by identifying letters with sounds as there's a 1 to 1 relationship in that direction. I.e. every written word has only one possible pronunciation.