Fly-by-wire is 4th gen. 5th gen use fly-by-light, correct me if i am wrong. More importantly though, these are control systems. The challenge lies in what they are trying to control. A drone, especially the kind that Turks build, are aerodynamically stable, as far as I know. Unlike 4+ gen fighters that are designed to be unstable. Moreover, they aren't air superiority platforms, so their flight envelope is not nearly comparable. Their control algorithms are much simpler. Not even close to that of a 4th gen fighter.
.
Compare that with what DRDO has achieved. Look at Naval Tejas. One of its most astounding features is that when the pilot trying to land on the aircraft carrier and tilts the stick to get a certain glide angle, that position becomes neutral in the autopilot, so the pilot now doesn't have to continuously make an effort to adjust the stick to have a constant glide angle. This almost takes the challenge out of carrier landings. I remember watching the entire online presentation at Aero India where they discussed Control Systems of Naval Tejas.
.
This feature of Tejas is so revolutionary, the only other plane I know that has this is the Super Hornet, which also only got this feature in around 2016. Such is the stature of Indian CLAW software. Meanwhile, Turks are impressive because they can do some basic MALE drones? Even University students can build FBW? Yes, but its complexity is a function of the beast you are trying to control and the situation in which you are trying to control it.