All that means is that DC telepaths don't have the ability to fight ghosts, Marvel telepaths on the other hand do.
Couldn't I just as easily theorize that Marvel ghosts don't have the ability to resist telepathy, while a ghost created by way of a mystical, Egyptian curse has said ability.
On another note, let's talk pseudo-science for a second here: It's pretty commonly accepted that "telepathy" is a concept that involves one character targeting another by way of their brain. A ghost is a purely intangible and spiritual presence. What writer had the brilliant idea of pitting a telepath against a presence whose actual brain sat decaying in the ground years ago? Granted, this is a fictional tale of fictional concepts, but it's still a showing that 100% violates it's own fictional rules.