..?! No? lol Imu was not fine with that. Saturn had to hide the robot and the fact they were studying it. If it was fine, Saturn wouldn’t need to protect them from anything in the WG
Oda is very deliberate with his story beats. Idk how you read that chapter and came to the conclusion that Saturn of the 5 Gorosei was being punished for allowing Luffy to escape, for reasons other than keeping the Joyboy hakified robot that gave him tremors around.