The smartphone in the video, which has a notch at the front, an edge-to-edge display, and a vertical rear camera in a body that's similar to the current iPhone SE, is very likely an Android clone device. Fake devices like these can often be found in China, where the video originated.
There have been rumors suggesting Apple is working on a second-generation iPhone SE, but none of those rumors have indicated the device will take on iPhone X design elements. There is no indication that the device in the video is a valid Apple product at all, and in fact, it conflicts with rumors we've heard about a potential future iPhone SE 2.
For example, KGI Securities analyst Ming-Chi Kuo, who often shares reliable information on Apple's upcoming products, has said that if a new iPhone SE 2 is indeed in the works, it's not likely to offer design updates or outward-facing changes due to Apple's work on the three iPhones expected in September of 2018. Kuo is, in fact, skeptical that a new iPhone SE 2 is in development right now.
Rumors about the iPhone SE have been somewhat conflicting in general. Supply chain rumors in November indicated an iPhone SE 2 would be released in the first half of 2018, but recent information suggests Apple has no plans to introduce a new iPhone until later in 2018.
Sketchy rumors from a Chinese site also recently said Apple would introduce a new iPhone SE that looks similar to the current iPhone SE at WWDC, but the site has no reliable track record.
All in all, Apple may have a new iPhone SE 2 in the works, but it's unlikely that the device is going to adopt iPhone X elements as the iPhone SE is a low-cost device while the iPhone X is Apple's top-of-the-line flagship smartphone.
Later in 2018, Apple is expected to introduce a second-generation iPhone X with a 5.8-inch OLED display, an "iPhone X Plus" with a 6.5-inch display, and a lower-cost iPhone with a 6.1-inch LCD display. All three of these are expected to adopt edge-to-edge displays with minimal bezels and the TrueDepth Camera system for Face ID.
It could perhaps be argued that the device in the video is the 6.1-inch iPhone, but we've heard no rumors suggesting that particular device will have an iPhone SE-style body thus far.