Think of the statement as more of an expression of intent, therefore.

A person who has no capacity to make juridical acts shall be represented by his guardian for making or receiving an expression of intent.

In the interpretation of an expression of intent, the real intention of the parties must be sought rather than the literal meaning of the words.

Have you wondered why these solid expressions of intent look the way they do?

An expression of intent which an agent makes in the name of the principal within the scope of his delegated power takes effect directly to the principal.