Being able to illuminate anything has nothing to do with time.
All Einstein's explenations of time is Imo nonsens, it's catch and simple to understand, but seems to me ..very misleading.
It is true. The difference in the ages of the twins is not a trick, not an optical illusion, it is a real physiological physical difference.
We like to think of time as uniform fixed intervals. It is not. The rate at which clocks tick, atoms decay, your heart beats are all variable depending on your gravitational and inertial reference frame. Time only seems uniform to us because in general everything we encounter is in the same gravitational frame. In fact satellites and GPS systems encounter relativistic effects. The truth of the variablity of time (of change and process) has been repeatedly confirmed in all types of experiments and actual situations encountered in high energy physics labs and space exploration. Everything about the traveling twin slows; his heart rate, his thought processes, the rate at which his cells metabolize and age, etc. It is real.
We also like to think of space (volume and shape) and mass as fixed properties of objects. They are not. Space is flexible. The energy of acceleration increases the mass of an object (E=mc2). The curvature and shape of space itself (and the objects in it) is changed by gravity and relative motion.
This is not a drill. This is not a trick. This not an optical illusion or an Alice in Wonderland fantasy. This is the reality of space and time in the modern world. Your everyday conclusions about the fixed nature of time and space and the shape and weight of objects is wrong. Not just in theory but in fact. In one of the best, confirmed theories in all of science. A theory constructed mostly in the form of thought experiments (during slow moments in the patent office), the empirical confirmation of which awaited years and decades (in a vote for rationalism over empiricism).
Quantum theory, general relativity and evolution are the backbones of our modern understanding of our world. They are all confirmed theories.