Why wasn't Guenon a Hindu follower?

There was a passage in the Wikipedia article (I don't remember which version) about René Guenon (I no longer noticed it) that after many conversations with a certain Hindu guru whose name I've forgotten, Guenon realized that it wasn't advisable for him to become a Hindu despite his strong affinity for Hindu teachings, which ultimately led him to further exploration and Islam. The article didn't explain the main reason for Guenon's final recognition of the incompatibility of his potential conversion to Hinduism with his own life. Why didn't Guenon ultimately become a Hindu?