Unfortunately even with entropy as low as in the super-cooled superconductors of quantum computers you would still hit the wall for physical measurements that we call Heisenberg's Uncertainty Principle.
You can generate the randomness artificially with mathematics and code alone, yes. Low entropy would be technically impossible to detect if you ignore the physics perspective and don't create your randomness generator with only a few lines of code and a limited output or input.
Or fortunately that quantum computers have this as a problem, leaving security for all of banking!
I think there are a few different questions here:
1) What is random enough to provide security for generational wealth?
2) What is the most random system that you could ever create?
3) Are there sources that we think are random that could ever be backtraced or controlled?
4) Even if you have a purely random source, how do you ensure a flat spectral density?
It doesn't take much to make something be impossibly random.
I recommend a very different style of book, "A Short Stay in Hell", which deals with man who has to overcome randomness to get out of hell.