Article like this takes months to put in. It takes one minute to put this disclaimer basically cancelling the article with "but we will tell you why we're cancelling it later".
Trained scientists are capable of reading any article with a healthy dose of skepticism and does not need to be reminded of this for any paper. All papers have limitations and just because it is published even in a prestigious journal does not make it true. I think this notice exists for the casual reader and reporter and I also doubt the message would have been posted if it did not counter public policy.