I suppose is see this differently. The oracle is just an outside the modeled system source of information, which can just be the environment.
Can you be more specific. How can the environment be a halting oracle?
Purifying selection.
I dont think any of this matters in the long run!
Interesting answer 
Would you consider a computer designed with a very short life a halting oracle?
Not really.
I agree. Based on that I would not consider purifying selection a halting oracle.
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No one seemed to notice, but I was being ironic here. Don’t want to confuse people.