I consider Chogyam Trungpa as a great scholar and philosopher, but I do not consider him as an enlightened master. His saying on emptiness is correct as per the Buddhist philosophy. But his conduct may have wavered due to unconscious indulgence in sensory pleasures in the west. The left handed path of tantra is a legitimate path, where sex, alcohol and meat are indulged in. However it is important to maintain mental equanimity and consciousness during intake of alcohol and such activities. If one is mentally equanimous and aware during and after intake of alcohol one has passed the test. If one gets drunk and mentally agitated and unconscious, one has flunked the test. It's as simple as that. I had done such tests of alcohol myself consciously to gauge my own mental equanimity many years back when I had to attend an alcoholic party of my friends. Chogyam Trungpa can be considered as an example of a religious person who was great in theory and scholarship but a failure in practice. But I think he could have ensured proficiency in practice as well if he had a supportive and stable ecosystem around him. His training as a 20 year old youth in Tibet was disrupted by the Chinese invasion which subjected him to a lot of privations, impoverishment, trauma and extreme danger and he was fortunate to have escaped to India alive. From India he left to the west as a youth of 24 when he had not probably matured enough. He had a car accident at 28 that left him partially paralyzed and which probably disoriented him and led him to renounce his monastic vows. It was at this point onwards that he started leading a life of indulgence as a lay teacher.
There are different levels of enlightenment. While one may have a true experience of enlightenment, that enlightenment is colored by the individual's level of consciousness.