That something can be modeled using some Turing machine, doesn’t imply that it can be any Turing machine.
If I have some simple physical system, such that I can predict how it will behave, well, it can be modeled by a Turing machine, but me being able to predict it doesn’t imply that I’ve solved the halting problem.
A realistic conception of agents in an environment doesn’t involve all agents having unlimited compute at every time-step. An agent cannot prevent the universe from continuing simply by getting stuck in a loop and never producing its output for its next action.
That something can be modeled using some Turing machine, doesn’t imply that it can be any Turing machine.
If I have some simple physical system, such that I can predict how it will behave, well, it can be modeled by a Turing machine, but me being able to predict it doesn’t imply that I’ve solved the halting problem.
A realistic conception of agents in an environment doesn’t involve all agents having unlimited compute at every time-step. An agent cannot prevent the universe from continuing simply by getting stuck in a loop and never producing its output for its next action.