Are these Catholic dogmas really infallible/

[polonius]

Infallible decree, Vatican I:6:4

"For the holy Spirit was promised to the successors of Peter
• not so that they might, by his revelation, make known some new doctrine,
• but that, by his assistance, they might religiously guard and faithfully expound the revelation or deposit of faith transmitted by the apostles."


Following Vatican II, the list of about 14 supposed infallible ex cathedra papal teachings were reduced to only two: The Assumption of Mary and the Immaculate Conception of Mary.

But neither of these are reported in the deposit of faith transmitted by the Apostles.

From the Catholic Encyclopedia we learn that:

“The belief in the corporeal assumption of Mary is founded on the apocryphal treatise De Obitu S. Dominae, bearing the name of St. John, which belongs however to the fourth or fifth century.�

And

“No direct or categorical and stringent proof of the dogma can be brought forward from Scripture……To determine the origin of this feast we must take into account the genuine documents we possess, the oldest of which is the canon of the feast, composed by St. Andrew of Crete, who wrote his liturgical hymns in the second half of the seventh century, when a monk at the monastery of St. Sabas near Jerusalem (d. Archbishop of Crete about 720).

So neither are in the Apostolic deposit of faith.