I think you did do what you could do: speak out, out of a very real concern for his welfare.
Most counselors are more nuanced than to just call the child in and say "so and so said you did such and such". Likely, he's not going to be punished for this. However, it is a good indicator to a counselor that this child's 'troubles' are causing him to do things which feel creepy or upsetting or threatening to peers. The fact that you addressed it to the counselor instead of demanding the teacher put a stop to it tells me (and likely the counselor) that you aren't trying to get him into trouble, but are concerned for the boy. Just as the counselor did not discuss the boy's situation with you, it's very unlikely that your daughter's name will come up. Usually, as I said, a counselor is going to be more nuanced than that in asking questions and trying to open him up.
For what it's worth, maybe he did what he did with the bulleye app for attention because he really does need help and just doesn't know how to ask or what sort of resources are out there. Most kids don't really *know* how to ask for help. I think what you did was fine. And no, I wouldn't mention it to your daughter, either. If she does mention it directly, you can say that you spoke to the school counselor, because it seems like this boy needs some more people on his side and for no other reason, other than you were concerned about him. Kids do have to learn the lesson--- sometimes, it's hard to speak up, but it can be helpful if a person isn't doing well and needs more help than we alone can give. Good luck.