I think even you are reading it too liberally. It does NOT permit "cured" homosexuals.
>>When dealing, instead, with homosexual tendencies that might only be a manifestation of a transitory problem, as, for example, delayed adolescence, these must be clearly overcome at least three years before diaconal Ordination. <<
I take this to mean that they were never really homosexual at all, just passing through an ambiguous of confused phase. When it refers to what might not be disqualifying, it refers to mere TENDENCIES that were passing phases; Men with actual history of homosexual acts or of being proponents of homosexuality are still forbidden.
And it IS very new and very significant that being a proponent of a homosexual lifestyle is grounds for exclusion. True, it's something that was unthinkable before the late 60s, but the actual exclusion is new.