Lots of good stuff in there, including:
"The letter also made clear that, while the text does not apply to those already ordained, priests with homosexual tendencies should not have educational roles in seminaries."
but how will it be enforced?
This brings increased Catholic-as-society focus upon the importance and significance of Priestly character.
As in, their very compromises -- if, when they occur -- of these issues as to character in relationship to their vows, the Church and scripture, identify them as to this key issue of homosexuality, especially.
Already, I read many statements by many already in the Church who refuse to disassociate from homosexuality and it is by their own emergence in public view that they become known for their dissassociation from the vows they have claimed agreement and compliance with.
This is, actually, bringing the body of Catholic faithful into greater communion with one another and the church accordingly, and I think the specific 'hows' and specifics are yet to be defined, in response to your issue posed.
I'm curious about that too. Enforcement is key, and what has been sorely lacking for so long. I hate to be disrespectful, but some Bishops' heads need to roll.
The current seminary visitations may have some fall out in this area.
At least that's what I'm hoping.
"but how will it be enforced?"
Exactly. I'm not as optimistic about all this. Yes, there might someday be a real house cleaning, but I doubt it'll be on this Pope's watch. What I suspect will happen is that the reprobates will simply cool it for a few years on the hope that they'll be able to wait the Pope out.
"The mess" took more than a generation to create, it'll likely take a generation to fix. While I do believe we'll see improvements in the state of affairs in the western church, I'm not so sure those will come to fruition within the next 20 years.