Perhaps. I think it is also meant to limit priests offering the Traditional Latin Mass.
In the Traditional Latin Mass con-celebration only occurs at the Mass of the Ordination of a Priest and at the Mass of the Ordination of a Bishop. In the Ordination of a Priest according to the 1962 Missal the rubrics establish that the concelebrating priests be only those who are ordained at that Mass. Thus the priests attending the Ordination Mass of Priests do not concelebrate but only the Ordinandi. The manner of con-celebration at the Mass of the Ordination of a Priest is not identical to the manner of con-celebration in the Ordinary Form. Rather in the Extraordinary Form the concelebrating priest, at his Mass of Ordination, kneels at some distance from the altar. While the Canon of the Mass is normally read in "vox secreta," at an Ordination Mass the Canon Missae is said out loud by the Bishop. While the Ordaining Bishop reads the Canon of the Mass out loud the newly ordained priest(s) simultaneously recite(s) the Canon of the Mass in "vox secreta". Furthermore the newly ordained receive only the Sacred Host. The Ordinandi receive the Sacred Host on the tongue from the Ordaining Bishop while kneeling at the altar. Afterwards the Ordinandi receive a chalice of unconsecrated wine at the credence table as an ablution. The Ordinandi do not receive the Precious Blood. |
That would be my reasoning, too.