The translation jist is basically - talking about the movement being that the gears turn when the crown is in position. The balance wheel is now in the 7 o'clock per genuine. it used to use 9015 Miy, now it's an clone 3120. there is a difference in the balance wheel mechanism. something about the center part of the balance wheel (where the jewel is). They talk about the tapestries squares being the most accurate and the dial being the most currently accurate. Then he talks about the flexibility of the bracelet itself along with the AP flap being mobile vs being stationary. He mentions the finish of the watch is better than previous versions.
One thing to take away from the video though is that they're only comparing the authentic AP they've replicated. According to many Authentic 15400 owners here, the dial can reflect differently depending on the year you have (whether it be matte or shine). The price of the real 15400 is now in 60k ballpark.
Thank you. I appreciate. The replica for travel and bars and BUFF on wechat can do mods