It all seems like a bit of a weird response to me. I come from a reasonably upmarket area in a reasonably well off city, and while I'm 5 years older than Sunak, hardly anybody I knew had Sky, even by the time I left uni. If that's the only thing Sunak can think of that he couldn't have as a child in the 80s and 90s then his life must have been pretty privileged.Presuming people are claiming the young Rishi had Sky TV, despite claiming not to. But several people have posted reasons here why the photo must actually have been taken after he left home, if indeed he lived there at all.
The main thing I got from the picture is that it never previously occurred to me that his parents owned a pharmacy, rather than just working in one.