Any true teacher should make statements which the student can then confirm for himself. No more.
A real “guru” gives you methods whereby you can look for yourself.
Unfortunately, most people are not up to doing so.
Teachings are very valuable as they can guide where to look. That saves lots of time as one has the chance to inspect the relevant things first instead of engaging in endless journeys.
Manipulators like to indoctrinate others with truths that make them do things which is of benefit for the manipulator. The combination of certain truths are then known as ideologies. They are not made for the benefit of the people who live it out.