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.