I created the 65k Challenge XP Trainer over a month ago, and I have been using it since then, and I have not been banned. I have been using the 100k Challenge XP Trainer also without a problem. If you use this correctly and don't get carried away and try to get prestige master in a single day, there is almost zero chance that you will get banned.
I don't see how several people have said they got banned because of this trainer or the other one that I made. If you did, in fact, get banned because of either one of my XP trainers, it's because you used it while in an active lobby, or you forgot to close the trainer and left it open while playing a match. It could also be due to the fact that you used another hack (aimbot, wallhack, etc...) and they just now got around to delay banning you.