Why wouldn't it work with a wifi camera? It only needs wifi, which it has. I suspect that there may have been a mis-communication.
It's more likely that it doesn't support host mode, which would be required, among other things, to support a wired camera.
But let us know if you can make a wired cam work with a splitter. Do you intend to get power to both the camera and the tablet at the same time? That has traditionally been the issue.
I checked it out on youtube and seen a guy do it with a video grabber plug it to a tablet so I will look into the option too.