Now, just out of curiousity, when was the USCCB statement issued?
NDRHC was written in 2001 and approved by the CDWDS in 2002 (so I believe it is a binding document, not a “USCCB suggests for bishops to use this as guidelines for their own policies…” document):
In accord with the approval of these norms and following the confirmation of this action by the Congregation for Divine Worship and the Discipline of the Sacraments on March 22, 2002 (Prot. 1383/01/L), they are hereby published as
particular law for all Latin celebrations of the Sacred Liturgy in the dioceses of the United States of America.
I ask this because neither the GIRM nor RS mentions EMHCs by name when they had their sections on intinction. As I read it, since they are not explicitly mentioned by name, they should not be employing intinction when they distribute Holy Communion.
The GIRM mentions EMHCs in general in #162: “The priest may be assisted in
the distribution of Communion by other priests who happen to be present. If such priests are not present and there is a very large number of communicants, the priest may call upon
extraordinary ministers to assist him, e.g., duly instituted acolytes or even other faithful who have been deputed for this purpose.” It does not specifically restrict this to Communion distributed in a certain way.
To be technical, though, GIRM #162 also allows for each EMHC to distribute
either species. It does say one EMHC can offer both species (via intinction). GIRM #191, in speaking of the acolyte, says “the acolyte administers the chalice to the communicants
or holds the chalice if Communion is given by intinction”. Now, we know the acolyte (or EMHC) is permitted to distribute either the Host or the Chalice (from #162); but does this necessarily mean the acolyte is permitted to
perform intinction? I don’t think that necessarily follows.
I think the GIRM can be interpreted in this way: EMHCs may
assist a priest or deacon (ordinary ministers) in giving Communion by intinction, but only by
holding the Chalice for them.
But that’s merely my interpretation. I would suggest contacting the USCCB CDW first, rather than going straight to the CDWDS.