What is the author's style in The Electric Kool-aid Acid Test by Tom Wolfe?

Tom Wolfe describes in the Author's Note how he researches the book. He has never taken LSD or any of the other drugs that his subjects use, but he has access to the films, recordings and writings that the Merry Pranksters have made. Combined with interviews, his research materials far outweigh the finished book. No single Prankster could have written as objectively, including Ken Kesey. They are all too much into their subjective experiences. By necessity, only an author looking in from the outside can maintain objectivity.