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I do not think you were being fed a line.
Polymeric sand is most effective when repeatedly vibrated and watered into joints, I believe. This you would not want to do over mortared stone. Anyway, I would think mortar in the joints would make a much stronger and more waterproof walkway.
Perhaps you would consider adding color to the mortar, in an attempt to match it to the stone you select.
Incidentally, I am probably not too far from you, and am currently building the same type of hardscape for a client.
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