That is not the official catholic position. That is just a random webpage written by a self-proclaming catholic editor to promote their books. Do not try too hard to harvest for official catholic positions on matters that are not the core faith ones (and history of the Universe most certainly is not): there are more than a billion catholics around the world, coming from any social status and literary level. There cannot possibly be a position common to all of them on nearly anything, except maybe core faith matters.

That said, you are right in your conclusion, because it is true that (nearly all) catholics are "creationist", in that they believe that God created the universe and everything in there. But many of them also believe in evolution via natural selection, in the very same way you believe it and as shown by the proofs and scientific thinking that our society has accumulated. There is no hex editing by God: it is still true that evolution happens under the guidance of God, because it happens under the laws he created. But (actually, just because of that) without the need of touching anything. On the other hand, it is also true that he may do some hex editing if he wished to, but many catholics agree that there is no need to believe that this has actually happened.