don't panic. the pope is a science retard. so it's "just a theory". he doesn't offer any logical reasoning to his claim in his homily. ironically, his claim can be falsified by his own words: "we must not let our minds be limited by theories that always go only so far and that - at a close look - are far from competing with faith but do not succeed in explaining the ultimate meaning of reality."
pope's hypothesis: The universe is not the result of chance, as some would like to make us believe. In contemplating it, we are asked to interpret in it something profound; the wisdom of the Creator, the inexhaustible creativity of God, his infinite love for us.
test: We must not let our minds be limited by theories that always go only so far and that - at a close look - are far from competing with faith but do not succeed in explaining the ultimate meaning of reality.
does the theory pass the test - well you decide.
this is my view:
if we asked or demanded to believe that god created the universe then is there room for a reality check? is there room for a explanation - rational or otherwise to be tested or debated in the catholic church? if our convictions are based on faith then how can we see anything else other than what we believe? so no matter how close we look we see the same thing. so his test cannot falsify his hypothesis. his hypothesis is not scientific at all.