The main point is that your scalp is also skin and can sag due to gravity, which in turn affects how lifted your face looks [00:23].
The video demonstrates a technique to lift the scalp using a device with an electric current set to a value of 4 [00:39].
The technique involves moving the device slowly across the scalp with the goal of lifting it up to the hairline [00:58, 01:23].
The video suggests you can feel your scalp to check if it is sagging and recommends performing this lifting technique if it is [01:31].