If one knows anything about Catholicism and hopefully this includes Catholics, know that the Pope is not “infallible” in all things.
Papal infallibility can be defined as: When the Pope (1) intends to teach (2) by virtue of his supreme authority (3) on a matter of faith and morals (4) to the whole Church, he is preserved by the Holy Spirit from error. His teaching act is therefore called “infallible” and the teaching which he articulates is termed “irreformable”.
See also: http://www.ewtn.com/faith/teachings/papac2.htm
You are so right. This was an interview, not a doctrine or a dogma pronounced by the Pope or the Magisterium.