So far, the source document from the Vatican is only in Italian. However here is a key translated quote from your link, "The aim of priestly formation in the affective-sexual realm is the ability to welcome celibacy as a gift, to choose freely, and to live this responsibly,"
I have had an opportunity to visit with novices and professed clergy in the Order of Preachers. Kind of up close, behind the doors kind of thing. They are regular young men trying to live this very calling as dedicated as possible. For some, it is too much. They fail, they try again. Maybe some don't struggle at all? However, it is a mistake to think that they enter this calling with this aspect all worked out (remember we are talking about new priest in formation, most likely not ordained).
Some struggle with pride, with sex, with substances, and on.
It is right to pray for them, because this is a great calling that takes everything to meet. However, God gives them the grace to overcome.
I did notice something, that they are very comfortable around men. Not in a overt sexual way, but in a way that I could not as a man called into marriage. It makes sense to me that they have this quality, because they will spend probably the next 50 years or more living with other men.
“Falsehood flies and the truth comes limping after it” -Jonathan Swift, 1710