"Is our reality a prison even after death?" - This was the question asked by the OP and there is only one true answer to that question.....I don't know.
Anything any of us say is only ever going to be speculation since none of us are dead, we'll never find out until the time when the biological processes which allow the physical body to live cease to function i.e. clinical death, and no amount of subjective evidence, claims on the internet or second-hand seance stories of life-after-death/reincarnation or whatever you choose to believe will constitute proof.
Everyone on this forum will have had experiences induced through natural or chemical means which have altered their perception of what reality is. Most of us 'come back' to what you could term 'concensus reality' with new perspectives, ideas, emotional experiences and suchlike which we try to integrate and understand based on our own understanding of ourselves. We are afforded experiences which seem to demonstrate that reality is not singular, that what constitutes concensus reality is not all their is and in many cases cause us to change our viewpoint considerably.
My problem with conspiracy theorists like this OP is that their own self-proclaimed logic is flawed from the start. By disregarding science they can disregard any attempt to use empirical evidence to demonstrate the discrepancies in their own theories. Much as I agree that science does not explain the entire human experience, and probably can't unless it develops much further than where we are right now, it can certainly explain more than the 'intuition' claimed by the OP and the results can be verified independantly.
You state the following:
"Science" has no universal validity to explain reality. We are in a system, a structure of some sort, in which rules apply. You cannot deny this.
Science, with or without the inverted commas, is the measurement of the observable elements in the very system you're referring to. Gravity? Thermodynamics? Or are those the result of some fiendish conspiracy too, dreamt up by the matrix agents to ensure that we continue to stay on the ground?
"Probabilities do not apply anymore here. All internal science rules could be fake. So much to your wonderful science. Even Science seems to be some kind of god these days...actually I understand scientific methods very well ;-)"
Probabilities do not apply anymore? What?! How can a probability NOT apply? Explain that for me please as I genuinely don't understand what you mean. While you're at it, could you also explain "internal science" for me? I'm not trying to be pedantic, I just don't know what you're actually talking about.
The deification of science is a sentiment usually spouted by the more fundamentalist religious factions and serves to indicate your own personal, if not publically expressed, view on the matter. With regards to your claims of understanding scientific methods, I suggest that your understanding is based on the flawed knowledge of others and what you learned in high-school.
Now, I'm someone who's a qualified psychiatrist and practicing psychotherapist. I've also been involved with occultism and yogic practices for many years, used substances from LSD to codeine in my own internal explorations and who, admittedly, loves a good conspiracy theory. Much as I may come across as being opinionated and self-righteous, it's an unfortunate side-effect of writing in a forum and I am genuinely very open minded, accepting and positive but I refuse to sit back and watch someone try to lead other people into their own reality tunnel when they have no proof beyond their own misconception.
You can choose to believe that the world is out to get you but you'll drive yourself even more insane. On the other hand, you could believe that the only certainty in life is change and that every day you make your choices, accept the consequences and walk your own path in life.
Good luck with whatever you choose.
O.A.C.