" I would have no idea what the Catholic Church means by its doctrine."
Right you are. That's why you should not condemn what you admittedly do not understand.
"Is the Catholic Church attributing those attributes and the “theosis” of man to that indwelling Spirit or to man himself?"
The former.
Those who hold the latter -- e.g. the Leadership Conference of Women Religious, who have been flirting with panentheism and New Age syncretism --- are squacking (skwawking? squaw... whatever) that they've been hit by a Doctrinal Assessment under Pope Benedict, which is one of the first things reiterated by Pope Francis when he took office.
In other words, they've been called out for setting up their own counter-magisterium which opposes the Church's own understranding of doctrine. Those who do this are either out (e.g. Matthew Fox) or on their way out.
Can I have an Amen?
( The tagline is Ephesians 4:15)
You mean other than their history of crediting man in places that God should get the credit? That alone indicates that they would assign that to man. I will do more research on this topic to determine what the CC actually believes.
>> The former.<<
We will see.
>> Can I have an Amen?<<
I suppose it depends on what any particular person or group disagrees with the magesterium. Call me cynical. I have seen way to much error to trust the "magesterium".