But even those premises don't sit at the right theoretical level for the application of Ockham's razor to be appropriate.
In the scientific context, the principle of
parsimony (much the same thing as O's razor) is used to help decide between competing theories. Theories, in science, aim to explain observational phenomena and to predict similar events in the future. The claims that "humans will one day be able to simulate reality" or that "such technology, if developed, will be widely used" are not theoretical claims in this sense. They are statements, or factual claims, which do not aim to explain observations, but instead speculate about the future state of affairs. They may themselves be grounded in theoretical considerations (indeed, ineveitably they should be if they are to be made in a scientific setting) but they don't strike me as reasonable candidates for the basis of a theory.
The argument appears to be a deductive one to me. The premises are being proposed as reasonable claims and then a probabilistic argument ensues. While it ends up making claims about how we should explain our experiences it is not
primarily a construction of a theory which aims to do this - this is just a consequence of the conclusion. Does this distinction between a deductive argument and a hypothetico-deductive theory make sense, or are my claims still striking people as bogus?
I'm not saying that these premises can't be attacked; they can be. When a person makes an outlandish claim like 'hedgehogs can fly' you needn't crack out Ockham's razor (as I have argued, it would be inappropriate) - you need only ask "where is the evidence?".