Comparing this corner kick tactic with two players going off the field but only one taking the throw in a 'normal way' is comparing apples and oranges. One is a deception tactic, the other isn't. Here is a comparable throw in.
In a game where multiball is allowed, two (or even more) players go off the field, each grab a ball and run towards where the ball went out. One of them pretends to throw it in a certain direction to attract defenders but doesn't throw. The other player throws it in another direction. I won't allow this to happen. Would anyone else? Multiple times in a game?
Not everything is directly spelled out in law. Player constantly look for way to gain an advantage over their opponents that are not clear in law. Some are within the spirit of law, some are not. With the ones that are not, if we referees don't take care of it, law clarifications will follow. Pretending to set the ball for a team mate but counting it as the restart at a corner click is a good example. Another is the feint at the end of a runup to a penalty kick. Both used to be within the wording of the lotg but not the spirit of it. Clarification outlawed them after they became widespread.