It makes sense because the Eucharistic Celebration itself is known to the Church as the Sacrament of Unity. And when that Sacrament is ripped and rent either by Kiko's heretical practices or any celebrant's self-authorized liturgical liberties, the Body of Christ itself is "ripped and rent." Thus the Church guards the Sacred Liturgy as it does the very Body and Blood of Jesus Christ.
Can. 838 §4. Within the limits of his competence, it pertains to the diocesan bishop in the Church entrusted to him to issue liturgical norms which bind everyone.
What had happened was that the Pontifical Council for the Laity, headed by Cardinal Stanislaw Rylko, had prepared the text for a degree of blanket approval of all the liturgical and extra-liturgical celebrations of the Neocatechumenal Way, to be made public January 20 on the occasion of a meeting scheduled between the Pope and the Way.
The decree was redacted according to the guidelines of the Congregation for Divine Worship, headed by Cardinal Antonio Cañizares Llovera. The founders and leaders of the Way, Francisco “Kiko” Argüello and Carmen Hernández, were told about it and joyfully told their followers about the imminent approval — all unbeknownst to the Pope.
VATICAN CITY, 20 JAN 2012 (VIS) - The Pontifical Council for the Laity today published a decree approving the celebrations contained in the Catechetical Directory of the Neo-Catechumenal Way. The decree is dated 8 January, Feast of the Baptism of the Lord, and bears the signatures of Cardinal Stanislaw Rylko and Bishop Josef Clemens, respectively president and secretary of the council.
Benedict XVI found out about the text of the decree a few days before the meeting on January 20. He found it illogical and mistaken. He ordered that it be scrapped and rewritten according to his guidelines.
In fact, the decree that was made public on January 20 limited itself to approving the extra-liturgical ceremonies that mark the catechetical stages of the Way. In his speech, the Pope stressed that only these had been authorized. With regard to the Mass, he gave the Neocatechumenals a genuine lecture — almost an ultimatum — on how to celebrate it in full fidelity to the liturgical norms and in practical communion with the Church.
It is the task of the celebration in the small communities — regulated by the liturgical books that must be faithfully followed, with the details approved in the Statue of the Way...
There is NO such thing as "the Neocatechumenal Way Liturgy." There is only the Sacred Liturgy and its two forms: Ordinary and Extraordinary.
"...as far as it pertains to the celebrations of the Paschal Vigil and the Sunday Eucharist, […] articles 12 and 13 [of the Statutes], read in their entirety, constitute therefore the regulatory charter of reference."