For example, while there are no doubt many shopping malls in Istanbul, I doubt there is "at least one in every neighborhood!" (unless that word is better translated as something more like a suburb)
This makes it harder to trust all of the details of the more serious accounts of police aggression, or the simplifed context of things like "The whole country is being sold to corporations by the government". As another commenter has pointed out, even photos can end up being from unrelated events.
This is not to say that this person's perspective is not extremely important, or that the Turkish state is not committing indefensible acts of aggression. It's just harder for outsiders to piece together a full and accurate picture of what is happening. Fortunately, multiple individual perspectives can help corroborate and enhance the picture to quite a degree.
Edit: Certainly media has biases too, although there are at least in theory standards for verifying reported facts, and the bias is (often) more about what they choose not report or what context is not given.
Edit: good points by buro as well. This account and others may well be very reliable, I'm more speaking from experience with past events that were reported in similar ways where key important facts turned out to be wrong or missing. (I know, that happens sometimes in traditional media too)