Yikes!
I’m going to say, I don’t think so. It’s pretty obvious the rest of the audience, adults and kids alike, is rather horrified at this.
The priest is pissed off about something, but holy hell!
I’d say that calls for an immediate assignment to funerals only. Before there’s cause for one.
Survival Of The Fittest?
He used to do funerals, but was reassigned after pushing over coffins.
In fairness, we don’t see what happens before the plunging. Maybe the baby was trash-talking about the guy’s mother or something.
It looks to me more like a starving man trying to break open a coconut with a large rock.
Well, if that kid comes up with any sort of mental issues, I’m smelling a fat lawsuit in somebody’s future.
It’s not enough to just wash the baby sins away, you gotta scare the demons out too or else they just get you dirty again.
I noticed this in the Twitter comments:
“Just thinking out loud: I’m glad he doesn’t perform circumcisions.”
Just for info, this one made Snopes: Is This Video of a Baby Being Violently Dunked in Water Real? | Snopes.com They rate it as “mixture”.
Then there is this version, a little more gentler but the kid gets dunked first head-, then feet-first, three times: Epiphany marked with baptisms in Georgia - YouTube
It’s worse than I thought. They all hate babies.
He’s moving the baby rapidly up and down while not supporting the baby’s head.
The priest in the different video Railer13 cited is supporting the baby’s head and neck very carefully.
It looks like an industrial-strength version of this Romanian Orthodox Christening. I’ve been to a few Orthodox and Eastern Catholic Christenings that look more like this or this(go to 16:10).
It’s called a “baptismal font”.
I watched the last two links – yeah, that’s what I would expect a whole-body immersion of an infant to look like. The baby supported, the whole thing done quickly and efficiently, and an attempt to prevent the baby from taking a breath underwater.
Potato/Po-tah-to 
Baptismal Font? Is it sans serif?
Which to me is a weird label for what they actually say, which is that they cant verify the video, but that infant submersion baptisms are a thing, and that there is a trend to do them quickly in mass baptisms.
That’s not a mixture where some aspects are true and others are false. Since they use words for their raitings, not symbols, I don’t see any reason they couldn’t use more: “Unverified video, but real practice.”
I have been to a few Greek Orthodox Christenings and although they submerge the child under the water it was done with care and finesse.