Can you please quote what you are talking about?
Seventh Session,
CANON XIII.-If any one saith, that the received and approved rites of the Catholic Church, wont to be used in the solemn administration of the sacraments, may be contemned, or without sin be omitted at pleasure by the ministers, or be changed, by every pastor of the churches whomsoever, into other new ones; let him be anathema.
The New Service was created against the will of the Church and thus against the will of Christ. It is therefore always illicit (not allowed) and those who knowingly attend it, share in the sin of its creators.
Other of its features are subjects of prior condemnation by the solemn Magisterium.
The Church forbids one to approach a doubtful sacrament under pain of sin.
Plus it is always a sacrilege and blashphemy against the Holy Mass of the Church and exposing yourself as a witness to these evil things harms your soul.