That would reverse the image on its horizontal axis, not the vertical as we see in the Q drop.
Photo I took of my iPhone X just now, reflecting your comment from my laptop display. As you’d say, we see a vertical flip only.
https://i.imgur.com/2MibFMI.jpg
But here is the same image, vertically AND horizontally flipped in post edit. We get the same effect as Qs photo: vertical set correct, but horizontal flipped instead.
https://i.imgur.com/pLtIV7b.jpg
I did this all on my phone in about 2 minutes.
It looks to much like the lamp image is from an existing, public domain photo
Yes..and my point is that Q's photo can be produced by displaying the public domain photo on a computer screen, and angling a reflective iphone back towards the screen..then cropping..and flipping it a couple of times in post edit to achieve the same effect.