I think to better understand this we need to begin with a few key conceptual agreements.
First off is if there is a beginning, there must be an end. The conceptualization of infinity and its very existence will collapse once the ability to perceive the idea passes.
That is step one.
Next you need to grasp the fundamental principle of life which is to live, thus prioritizing survival, perpetually striving to forever put off death, such as evolution.
If you can recognize the human race as being the dominate species on this planet, then you can recognize our development of methodologies we use to stave off inevitable death.
Ok this is the big one, survival is directly correlated with the mastery and use of the surrounding environment, eg. We live on earth because we have evolved/adapted to sustain ourselves through breathing air, drinking water, eating food, etc.
Now if we can tie the ideology of the Kardashev scale with the natural relation between survival and environmental mastery it is only rational to see that once a civilization has expanded their power usage to a solar system, or a galactic system, it becomes very easy to see how our existence could very well be part of an experiment.
Because even if we look at what we do now at the level of our tech. We run our own simulations to the best of our ability. Flight simulators, racing simulators, computer models, hell even look at the
Stanford Prison Experiment.
I can't even imagine what kind of tests/experiments/simulations a civilization that has advanced to such a technological level as to harness our solar system, yet alone a galaxy would create in order to answer the questions they pondered?.
This to me is what is so interesting if you include things like the
Fermi Paradox, where mathematically we should see other civilizations when we don't.
Our we the control group of an experiment to see how this particular strand of DNA would develop without influence from the outside world? I mean we already grow cultures in labs to study micro life forms. To believe that we could be an different is a dangerous line to walk.
I think what is most intriguing thing is either, we are, by some insane, truly insane, chance that we are the very first civilization therefore can't possibly be living in a simulation. Or, we aren't, and the possibility that another life form achieved a technological level far superior than we realize possible today and developed a simulated reality in which we live in and they study.
Remember that it is based on probability, neither of those two scenarios can be true, but they do exist within the realm of possibility based on the current knowledge we possess.
If we can theorize the idea of a simulated reality, then only by natural progress do you also believe it will be achievable one day, in one form or another.
I don't think many people would have believed humans could fly in 1000 AD, and then some started to, and then we did. It is just progress.