Krishna offers a quiet assurance. Those who follow this teaching — even without perfect understanding — but with faith and an open heart, free from cynicism, are released from the binding power of karma.
The phrase 'te api' (they too) is generous. You do not need to be a philosopher. You do not need to grasp every metaphysical subtlety. Shraddha (faith) and anasuya (freedom from fault-finding) are enough to begin the journey. Practice what you understand. Trust what you cannot yet see. And the teaching will do its work.