You seem to think that there is more than one type of "transferred mile". Where does it say that?

That there is no specific page for "transfer miles from your credit card" is entirely explained by the fact that such transfers must be initiated from the partner website. That doesn't, however, seem to justify your opinion that these "transfer miles" are not "transfer miles".

If you have any further queries on the matter, I advise you to take it up directly with:

Alitalia Loyalty S.p.A.
Via Alberto Nassetti s.n.c.
Fiumicino, RM 00054
Italia

https://www.alitalia.com/en_en/mille...red-miles.html