I've described - a bit loosely, I admit - what thermodynamic entropy is, earlier in the thread. It is not about what a given observer can see. It is about the distribution of energy among the microstates of the system. https://en.wikipedia.org/wiki/Microstate_(statistical_mechanics) Boltzman's formula for entropy is S=k lnW, in which W is the number of states available. The Hawking quotation you give in post 20 (for which you have not given a source - it would be useful if you could do that) is consistent with this.