The following clip shows the incident:
Of course, this is a tremendously important signal going through the world (which the video indeed did in the past days). It can be doubted whether admitting that you have simulated inside the penalty area makes the simulation itself much better (can unfair play be compensated by fairplay?) - but for sure, it shows that attackers, who are knowing there has not been any contact or who are even guilty of a dive, can handle such situations differently than it happened a few matchdays ago in German Bundesliga or the Spanish Copa del Rey for example (in both cases, a penalty was given):
While such actions can be appreciated and would be very needed on higher footballing levels, too, we as referees should of course fulfill our duty to identify this kind of blatant unsporting behaviour ourselves, e.g. by being positioned correctly, which was not the case in the first clip.
That's why we are going to put more focus on educating how simulation can be identified more effectively by presenting you multiple clips on that in the coming year.
By the way - if a player admits that he has simulated and managed to deceive you, but admits it. Would you still caution him?