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I believe these picture the work of Photoshop check out the guys hands. It is bigger than his whole entire body. I could be wrong. If he has elephant hand syndrome. I want to apologize for the comment.
I don't think the photo was photoshopped BUT it's a photographic effect that many on this forum (and on eBay) have used. You just stand directly opposite to the camera and hold out the fruit toward AND close to the camera lens.
This is why we should always reason in terms of proportion. In such a case, you compare the fruit size to the hand. And NOT to what your eyes perceive.
That photographic effect is enhanced even more by using a wide angle lens, which it seems is what was used in that photo. If you go to extreme of using fish eye lens, 25mm or less, then the proportions are distorted even more.
It's not uncommon to see soursops over 10 pounds here. Have never seen one 15 kilos, but i wouldn't be surprised. There have been past threads from Colombia also about giant soursops. Richard N, the tree doesn't need to be 100 ft. tall to make a fruit that size. Remember that fruits are supported close to trunk. Jackfruits can also make very heavy fruits on comparitively small trees in this way.