rjmccall added a comment. In what sense is the bit-pattern of a null pointer indeterminate? It's implementation-specified, but the compiler is certainly required to be able to produce that value during the constant initialization phase. If the language committee wants to make this non-constant out of some sort of portability concern, that's its business, but it's certainly implementable even if the target has non-zero null pointers or even different null pointer patterns for different types (though of course `nullptr_t` uses `void*`'s pattern).
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