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Falsehoods programmers believe about null pointers
(purplesyringa.moe)
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Virtual memory has nothing to do with whether 0 is a valid address. You can have a CPU where it is valid, or one where it isn't and you'll get an access fault if you try to access it. You can also have virtual memory where page 0 is mappable, or not.
I think the author knew that, based on the later points so it's probably just bad wording. Interesting point about wasm too!