The relevant document can be found here
vatican.va/roman_curia/congregations/ccatheduc/documents/rc_con_ccatheduc_doc_20051104_istruzione_en.html.
What Cojuanco referred to as the “narrow band” of people are described as follows:
…the Church, while profoundly respecting the persons in question, cannot admit to the seminary or to holy orders those who practise homosexuality, present deep-seated homosexual tendencies or support the so-called “gay culture”.
The words “…profoundly respecting the persons in question” (as well as the previous paragraph) basically repeat what the Catechism says at 2357 - 2359.
Clearly, neither the then Pope did not consider the issue to be a simple one involving an “is / is not” test! However, as you can see, the Instruction does not say that all homosexuals persons are barred from the priesthood.