If he is not a US citizen or Green Card holder and was not on the US during the year, his earned income is not taxable in the US. So no need for Form 2555 - Foreign Earned Income Exclusion.

There is nio such thing as Foreign Earned Credit.

The pension is taxable in the US if it is US source income. Probably the social security is, too. Last I knew we only have an unratified income tax treaty with Chile. You may want to read it and see if you want to rely upon it, with proper disclosure.