This place is different from his home Universe. Although wisps aren't like humans or other common races, the Dalin Universe still has a lot of wisps since they aren't used as cultivation resources. Because of that, if Krune introduces the Myriad Wisps technique to them, there is no doubt that the wisp race power would explode in a very short time. It is different from the Luvile Universe, where the wisp race will need to gain its footing step by step.
It could be seen as a threat to the other races, and a mass wisp hunt might start because of that. That made Krune hesitate to whether he should spread his cultivation technique or not. Of course, he wanted to see that Planet at the very least.