Proposed resolution:

This wording is relative to N4582.

1. Modify [memory.resource.class] as indicated:

   class memory_resource {
     […]
   protectedprivate:
     virtual void* do_allocate(size_t bytes, size_t alignment) = 0;
     virtual void do_deallocate(void* p, size_t bytes, size_t alignment) = 0;
     virtual bool do_is_equal(const memory_resource& other) const noexcept = 0;
   };
   

2. Modify [memory.resource.prot] as indicated:

   [Drafting note: I don't know whether it's too late to change the section mnemonic [memory.resource.prot] to e.g. [memory.resource.priv] or perhaps [memory.resource.virt].]

   memory_resource protectedprivate virtual member functions [memory.resource.prot]