I love Ep1logue and have run it several times with good results, but as a rep, I'll just say that if you have any questions regarding the product or my experience, let me know and I'll do my best to answer.
I wouldn't expect for Ep1logue (or anything really) to build traps on their own without any training. However, traps are one of those muscles that get hit with practically everything. They get hit hard deadlifting, they get hit hard rowing, they get hit with vertical pulls, they even get hit squatting and benching. So I would certainly believe that it is possible to see trapezius growth with no direct trap training, and I would also believe that Ep1logue would aid in that growth.