Nope. That's the Church's teaching. Plenty of Catholics, particularly recent converts, aren't aware of everything their church teaches and believes. It happens.
Even if we were to confine ourselves to the snippet that you cut and pasted for us, and recognizing that it uses the word "purify" in a different sense than that which has been thrown around on this thread, what we have is a verification of what I've been explaining--
"The punishments of sin
1472 To understand this doctrine and practice of the Church, it is necessary to understand that sin has a double consequence. Grave sin deprives us of communion with God and therefore makes us incapable of eternal life, the privation of which is called the eternal punishment of sin. On the other hand every sin, even venial, entails an unhealthy attachment to creatures, which must be purified either here on earth, or after death in the state called Purgatory. This purification frees one from what is called the temporal punishment of sin."
I've noticed before that a lot of the fussing and fuming here is clearly a result of misunderstanding what's in black and white--or blue in this case.