If not the identities of the people, at least the camera and date, even though of course that information has not been confirmed to the public. The swimming photo is therefore interesting, as unlike some other evidence that contradicts the camera+phone timeline, it should at least in principle be verifiable. A 1st April date could contradict the camera+phone timeline.
The photo is rumoured to have come from from Osman's phone, and while the date is not confirmed, one often quoted is on or around 1st April. If this was true, that would mean all four people in the photo died within a year (including Osman very close to Kris and Lisanne).
Identities for those featured in the photo often suggested are: Kris, Lisanne, Osman Valenzuela and Jose Manuel Murgas. The only thing that is confirmed about the swimming photo is the location. There are quite a lot of quotes in here though, so it is not as bad as it first looks. I wasn't intending it to be this long, but ended up going down a rabbit hole and thought each point needed all the information I've included to go with it. First of all, a warning that this is quite a long post.