The device actually is a Torex XC61C but it looks the same as the Microchip.
But did you also watch the second video? Although it can work with that device the Chinese made a huge design error. The Hysteresis is ON TOP of that 2,7V. So it will only start to discharge at 2,7X x 1,05 = 2,84V... They should have used the 2,5V (or even the 2,4V version) version which will start to discharge at 2,5V x 1,05 = 2,63V
But that device is a bit hard to get... What about a zener?