I have not been stopped on the main Harohalli-Jigani route of late.
A few years ago (around 2015?) when there were a few incidents of trekkers going into the forest and some deaths, the guards were more prone to stopping riders, and I have stopped me once, but since I was riding in a group they let us go.
Raghalli I was stopped and told to turn back, have gone there only once.