Brown says that his theory explains many things which the general consensus fails to but doesn't go into any more detail than that, I wonder why.
I did some reading and he actually states that ice ages, frozen mammoths, the mid-Atlantic ridge, submarine canyons, coal and oil formation, ocean trenches, mountains, guyots, the Grand Canyon, strata, salt domes, and volcanoes are all unexplainable by the general consensus, all of which are completely explainable by it.
It's not hard to see why they left them out of the video.

I found a critique of this theory by an old Earth creationist, a physicist, which I'm going to paraphrase considering I am not a physicist, [even though it isn't really hard to see how this much change is near enough impossible to occur in 7000 years], and he did the calculations of the possibility of Brown's water tight layer existing under the earth's crust and found that for this to happen without the crust bursting there would have to be no Earthquakes, no volcanoes [there's a problem considering we have lava flows] and there could be absolutely no hills higher than one kilometre.
That renders all mention of mountains in the Bible before Noah's flood void.

The same physicist also discovered that if this water did exist it would be under the pressure of 1281 atmospheres, next to the core of the Earth, this amount of pressure and this amount of heat would mean that if it were to be released through the crack like the Hydroplate theory suggests, it would instantly turn to steam and boil the entire planet.

With Brown's own calculation of the water being released at 250 degrees fahrenheit which means that the water would be released from the crack at 2.02 atmospheres of pressure which is about 11 kilometres per second.
The water [now steam] would not even stay on planet Earth.
The physicist said that even if his calculations were off by 99% the water would still have been sent to Alpha Centurai.

I'm completely open to these theories, and if one comes along that isn't easily refutable and has the most evidence to support it I guarantee that not only I, but most of the scientific community will accept it, but it really doesn't seem like it's going to happen.