I've done some cross referencing and I believe that it's his dick pic. Here's why:
1) The texture and colour of the shorts match those seen in many of his IG pictures. The hair on the sides of his belly match those in a few pics where he is unshaven.
2) As for the whole cut vs uncut debate; some dickprints will look cut even if the individual isn't. There's a few factors which can impact that, namely where the individual pulls back regularly and/or has a large, emphasised nob. Furthermore, it's far more common for Latino men to be uncut than it is the contrary.
Even if it's not his dick pic, he's a beautiful lad and I really wish he did OF (I'm weak for Latino men).