It was a preview for industry professionals so it's most likely the final version of the film as it will be screened on cinemas, although different versions always exist - especially for release on streaming platforms and BluRay. There is frontal (at least two dicks) and rear nudity from extras in a locker room scene, which I guess gives the film the R rating.
Josh's dic is mentioned in the sauna scene where he shows his butt. He's supposed to have a big dick and he shows off in front of Mike's character who tells him to (paraphrasing) "put your dick away" and "stop swinging your dick around." So it makes sense that the script mentions that Josh shows his dick (which as we know is pretty big in reality!), but in the version of the film I saw it wasn't shown to the audience.