This is a critical point which must not be glossed over. It means, in effect, that nobody with homosexual tendencies can be ordained. That includes the celibate homosexual.
What are "homosexual tendencies?" Sexual activity? That can't be, as that has been ruled out.
Participation in the "gay movement." No. That's been ruled out as well.
This phrase simply reasserts the three conditions under which homosexuals cannot be admitted to seminaries.
Homosexuals who have been celibate for longer than three years will likely be admitted to seminaries and, if they continue to observe celibacy, will be ordained. The language is straightforward enough. The decision, ultimately, will be left to bishops and seminary authorities.
Homosexual tendencies are the attraction to an individual of the same gender. This is not rocket science here. And we don't need to parse the words or try to twist them. I may be alone in this (at least on FR) but I have a lot of respect for those who are homosexual by inclination and who are making an honest effort to live a Christian life of chastity. But I am of the opinion that even those who heroically resist the urges to commit unnatural acts should be barred from Holy Orders. The environment in which they would find themselves in is one that would sorely tempt them to sin. They would be surrounded almost exclusively by other men. In most cases they would be young men to whom a homosexual might feel an attraction. Unlike many on this forum who simply drip venom in their attitude towards gays, I believe in the commandment "love the sinner and hate the sin." It would be act of callousness bordering on outright cruelty to take a young man struggling against the temptation to commit unnatural acts and deliberately place him in an environment where he would be daily surrounded by such temptation. The Church commands us to avoid the "near occasions of sin." That commandment not only applies to us on a 1st person basis but it also proscribes us from knowingly placing others in a situation of grave temptation. It would be the equivalent of training an alcoholic to become a bartender. Charity and love demands that we do all in our power to help persons with this cruel affliction. Putting them in seminary would be a sin, not merely against the church, but also against the young would be priest struggling to control his passions. Obviously, there are some who are able to overcome and master this perverse inclination or at least control it. I do not doubt that there are some fine and totally orthodox priests who may have homosexual urges but live a life of chastity. But the danger to their souls and to others should they fail, is too great to take that chance. This document is the right course of action.