It seems they can't receive it unless they have use of their faculties.
Absolutely incorrect. You really have to stop posting stuff out of context.
That passage you cite is a quotation from the Greek schismatic practice and not the pope’s teaching. He’s going through all their practices and critiquing what must be changed in order for them to re-enter Communion with the Holy See. These Greeks actually had a more Novus Ordite anointing of the sick perspective on it, which the pope criticized.