Omnipotence is the term signifying God’s infinite potentia, that is, He Is.
There are things that are impossible, though they are not termed things that God can’t “do.”
For example, God can’t be evil. This is not inability, but simply the observation that God is Good, therefore, it is impossible that that which is Good be evil, for, were God to become “evil,” that would be Good.
If, by “absolute,” you mean an unwavering position based on God’s omnipotence, then, yes, I believe that such a position is in accord with Church teaching. However, I don’t believe the Church has spoke about “absolute” positions or otherwise, on the matter of omnipotence.