That is not about rubrics at all; it's about proper matter.
Without proper matter, transubstantiation does not take place. You can't consecrate a doughnut.
The only thing close to "rubricism" was the insistence by the mother that her daughter receive under some approximation of the species of bread. If she had simply accepted the Church's teaching that the full, real presence of the body, blood, soul and divinity of Our Blessed Lord is in both the Body and the Precious Blood, there would have been no controversy.
Bovine feces. With all due respect.