That could have been the surprise in TLJ; it was the reason Luke has been in exile - he sensed Palps was behind what was going on and was looking to track down his location. Wait…is that the explanation Force Ghost Luke gives towards the end of ROS? I forget.
Nope: he says “It was fear that brought me here,”
This line bothers me so much, specifically because Rian Johnson’s whole starting position dealing with Luke was that it couldn’t be fear that brought him to Ahch-To.