[visualops]

At that point, individually, each one of the naked infants’ backsides was dipped into the water three times, while Fr. Marcoux called out in sequence to each dip of the backside, “Father, Son and Holy Spirit.”

Not having seen the video, I can't say for sure, but that doesn't seem like a valid baptism to me.
I find these people who deliberately seem to be making up their own liturgy to be very scary people.

The requisite and sole valid form of baptism is: "I baptize thee (or This person is baptized) in the name of the Father and of the Son and of the Holy Ghost(Spirit)."
--snip--
"In administering this sacrament it is absolutely necessary to use the word "baptize" or its equivalent (Alex. VIII, Prop. damn., xxvii), otherwise the ceremony is invalid."

Now it is true that if the Sacrament is unintentionally administered incorrectly, through ignorance, that it is still valid if the intentions are correct.

[GipperGal]

I find these people who deliberately seem to be making up their own liturgy to be very scary people.

I find this "ritual" downright creepy -- especially the a@@ dunking part.

[gbcdoj]

Now it is true that if the Sacrament is unintentionally administered incorrectly, through ignorance, that it is still valid if the intentions are correct.

That's not correct. If form, matter, or intention are lacking (any one of these three), the Sacrament is invalid and absolutely must be repeated. "All these sacraments are dispensed in three ways, namely, by things as the matter, by words as the form, and by the person of the minister conferring the sacrament with the intention of doing what the Church does; if any of these is lacking the sacrament is not fulfilled" (Council of Florence, Decretum pro Armenis, Denz. 695)