T. Lobsang Rampa was an author who wrote books about spirituality, meditation, and Eastern philosophy. He claimed to have been a Tibetan monk in his past life and wrote about his experiences in Tibet in his books.
But there are some people who don't believe that T. Lobsang Rampa was actually a Tibetan monk. Some say that he made up his stories or that he was actually a British man named Cyril Hoskin who made up the story of T. Lobsang Rampa.
It's up to each person to decide what they believe about T. Lobsang Rampa and his books. But it's important to always be skeptical and ask questions before believing everything you read or hear.