There's more than one video? I've just given it a look, and, as far as I can tell, they've got just one video, where they test their ceramic plate against... M193 at 50 yards, and nothing else.
Short of testing against pistol rounds, that's probably the least informative test they could have run.
But there are nevertheless important things we can learn from that video.
First, it looks like their foam edging isn't
too excessive. The plate in the video survived a real edge shot. So it's not an 8x10" plate masquerading as a 10x12" plate, as so many Chinese-made plates (and some American plates, such as RMA's 1199,) are.
Second, the plate's interior is white-on-white, which means that it's alumina over PE. The manufacturer's specs claim that the plate is 0.8" thick. Given that thickness -- 0.8" -- and stated weight -- 5.9 lbs -- the plate's construction likely involves a roughly 6.5mm thick ceramic layer over 11mm++ of Chinese PE. (It can't be American PE, or the plate would cost far more than $130/unit.) We can infer from this that the plate may have trouble against tougher steel-core rounds, like the M80A1 and 7.62x39mm API, as the plate's ceramic layer may be too thin to disrupt or fracture their steel penetrators. Most "API-style" plates utilize thicker ceramic layers over significantly thinner and higher-quality PE layers -- but the math doesn't work out that way for this plate. Of course, the manufacturer doesn't claim that this plate will stop those rounds... and I'm actually quite sure that it'll have little trouble with the M855A1, in any case.
All in all, it seems like a really decent armor plate, especially when its cost is taken into consideration. If Skarr gets this thing certified and can keep pricing low, armor OEMs like Tencate and Hesco are going to lose some sleep over it.