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do you mean that a turing machine can't simulate the universe but some other kind of cpu (i.e. quantum) could?

This is all very theoretical so ... a turing machine can simulate a universe as it assumes infinite memory

No, I mean that it is physically possible to perform an unlimited amount of computation on a fixed amount of energy, if you are willing to wait long enough. Nobody has built hardware that has this property.

1W is one joule per second. With unlimited time, you also have unlimited joules trickling out.

You are not getting this.

You can do an unlimited amount of computation on one joule. One watt-second, if you like.

Not an infinite amount of computation, but any finite amount.

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