I interpret that sentence as taking about real computers, which does put it outside the category.

That's the definition of a normal error not a category error.

If you disagree, what do you see as something that would be in the correct category but wrong in the sentence?

The normal definition of category error is something that is so wrong it doesn't make sense on a deep level. Like for example if they suggested quicksort as an error correction code.

The mere fact we are talking about "real" computers should be a tip off its not a category error, since people can build new computers. Category errors are wron a priori. Its possible someone tomorrow will build a computer using a repetition code for error correcting. It is not possible they will use quicksort for ECC. Repetition codes is in the right category of things even if it is the wrong instance. Quicksort is not in the right category.