What is TOD?  It's very frustrating when people can't be bothered to use whole words.

IMHO, too much time is NOT being spent by Catholics on the 3-Days of Darkness (3DD) warning.

To argue in support of 3DD being true, there are many Church sanctioned cross-references to it.

It would come under the umbrella of “Chastisement”.   And to put that into context, the end of the 5th Age of the Church, which is now.  It is marked by an unprecedented “Chastisement”.

Venerable Bartholomew Holzhauser has described the “Seven Ages of the Church” quite precisely.

He pinpoints our era, “.. from the time of Pope Leo X to a strong ruler and holy pope.” And he calls it, “Status afflictionis et purgativus.”

None of the other six Catholic ages refer to a “Purgation” like ours does.

Other cross references to a major Chastisement are, Ecuador’s Our Lady of Good Success, La Salette and Fatima.  Many Holy Catholics and mystics have warned of it too.

I would agree with the video presentation that we should not dwell on the mechanism of how and why 3DD will be implemented, but be prepared for it:
(Blessed candles, window coverings, Rosaries, Images of Our Lady’s Immaculate Heart).

3DD should give Catholics consolation that this evil world will be purged and cleansed, not unlike Sodom & Gomorrah.

But would you say, Vn. Holzhauser's interpretation of the Book of the Apocalypse on the concept of the Seven Ages of the Church is part of the Church Magisterium, as written and approved by Popes and Bishops?

I'd take Ven. Holzhauser's prophecies with a grain of sand. He predicted that 120 years after the execution of Charles I, England would convert and do more for the faith than after its first conversion. This did not come to pass. He also predicted the Great Monarch would destroy the Mohammedan Empire, which in his day was the Ottoman Empire, but that has already fallen. A new one could come to be, but still in combination with the prediction about England it casts some doubt.

"One of the predictions was that England would not have the Mass for 120 years, priest would not be able to say it under pain of death, after which England would convert and help to spread the Faith after its conversion, this seems to have been partially fulfilled for the prohibition of the Mass under penalty of capital punishment was enacted in 1658 and partially recalled in 1778." Source HERE.  

"At Brescia in 1486 Savonarola preached upon the Book of Revelation, the first manifestation of what was to become his obsessive preoccupation, an Apocalyptic interpretation of his own era. God would judge and punish society for its wickedness, he prophesied, and the regeneration of the Church would follow. Savonarola was prone to prophesy, and the number of his prophecies that were fulfilled is astonishing. Renaissance Society was indeed punished for its degeneracy by the Protestant Reformation, and the Church was indeed regenerated by the Counter-Reformation Popes beginning with Pope Paul IV. He also prophesied correctly that Lorenzo de Medici would shortly die, as would Pope Innocent VIII, that the sinful Medici tyranny would be overthrown by the French; that the Chair of Peter would be occupied by a simoniac; and that his own mission would last eight years after which he would be hanged, burned and his ashes cast into the River Arno. He foretold events that it would have been humanly impossible to foresee, such as the separation of two Dominican Congregations, those of Lombardy and Tuscany. He also prophesied that the Turks would be converted within ten years, that Rome would be taken, sacked and filled with desolation, and that the republic of Florence would disappear thirty-two years after his death. These prophecies were not fulfilled."

From Michael Davies' talk on Savonarola, a transcript of which can be found HERE.

• (1) the Status seminativus, from Christ and the Apostles to Pope Linus and Emperor Nero, is typified by the first day of creation "Spiritus Dei ferebatur super aquas", the gift of wisdom and the age from Noah. Similarly he treats;
• (2) the status irrigativus, the days of persecution;
• (3) status illuminativus from Pope Sylvester to Leo III
• (4) status pacifitcus from Leo III to Leo X;
• (5) status afflictionis et purgativus from Leo X to a strong ruler and holy pope;
• (6) status consolationis from that holy pope to the birth of Antichrist;
• (7) status desolationis from Antichrist to the end of the world.