I think he is speculating as to what this cross would look like if he were to let it happen. These are pictures of suposed Trimac X Festae crosses taken from the internet. Could be (?). Often, the problem with these kinds of pictures is that even the owner of the fish doesn't actually know for sure who the parents are and is simply speculating based on what he sees in the fish. And when it comes to crossbreeds, often it is difficult to be certain what both parents are unless we have actually crossed the fish ourselfs.......all of us tend to see different fishes in a hybrid. About the only thing certain with these 2 fish is that they have Trimac in them, probably of flowerhorn origin.
Just to give an example of the kinds of speculation, we have a thread in the hybrid section of "all the hybrids on MFK" and there are pictures of blue acaras, nics, and spilirum ect. with the claim that they are some type of cross, not to mention numerous kinds of CA hybrids with a claim of them being this or that, even though the parents are completely unknown by the person making the claim.