I'll play the cocky bastard here. It was discussed here, a number of separate times, and if it's doable, it won't be easy to pull off. There's some other plane that I fly non-stop since it was added ~7 years ago, and a number of maneuvers as off the wall as Candelaria's require you to control the plane exactly right, not fraction of a second too early or soon nor an inch too short or far. I've pulled them off a few times and probably couldn't on demand right now, even after a whole night of practicing them. e.g. a Cobra (slightly canted but identical in function and sequence), or something functionally identical and visually only a bit different from that twirl by Candelaria.
It's very difficult to pull em off correctly, and random players, who by all appearances don't have much stick time in the game, can't credibly just dismiss it as impossible.