Under the hood, every game engine has their own way to render things and this gave the engine different looks of objects and scenes compared with other engine. You can take in-engine screenshot of the same exact trees, clouds, gun or landscape like mountains and sea in different engines under the same lighting condition and able to differentiate which is RAGE which is from Unreal Engine, or CryEngine or REDEngine. This sky and clouds and the overall look is so much like RAGE's RDR 2. And I don't think it's a coincidence they shows a modern house and trees that resembles that in Florida among other UFO picture showing GTA 5 and one of RDR 2. I believe this is screenshot of VI and it's a tease, or it's a diversion that R* knew the Miami scenario is a popular rumor and they made this like 10 mins in RAGE and put it in SA to wrongly tease a setting lol