Tintin Book Collection

I would like to know if you think that Tintin and the Lake of the Sharks is a Tintin book and should be considered when trying to get a "complete collection". I am trying to get all the books and out of the 24 written by Hergé I have 23 of them (Complete Collection Box set). The one I am missing would be Tintin in the Congo(Planning to order it). While I am trying to order the remaining books to finish the collection I am debating whether the Lake of Sharks book is really belongs as a "Tintin" book. I know the book still has the name however if you read it you can tell it is not in the "style" that the other books. My question for you is if you consider it a "Tintin" book and if it belongs in a Tintin collection.