Good find thanks.
To me, the document you found seems very helpful with regards to the issue of IUI. It says that procedure is neither “approved” nor “disapproved”, so, as far as I understand Canon Law (disclaimer: I’m no Canon lawyer), it would be acceptable for a Catholic in good conscience to elect such a procedure, after close consultation with a trusted priest and much prayer.
Pinging someone who may have some educated insight to add.
I believe in marriage and conceiving children the old-fashioned way and trusting that God will not place burdens upon us that we cannot bear. I have a good friend who is a volunteer NFP educator. In his professional life, he is employed by EWTN. I do not doubt his Catholicism but I do think that promotion of NFP is a mistake. Whatever the arguments for it and the pretty and soothing language, it is still birth control. The Church has authority. I don't but I harbor the hope that the Church will reconsider as to NFP. Acceptance of a contraceptive mentality (however "natural") has done more damage to the Church than any other modern mistake.