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I’d use Mollys. The Hardi board is more than strong enough to support most anything you plan to put on those shelves unless it’s stacks of gold bars but, I wouldn’t use anything tapped into that. Standard bit will work fine. Though it has cement, it’s actually cement infused paper fiber. You don’t need a masonry bit. If you want to get fancy, a carbide tipped bit will do the trick pretty cleanly.
If you have full sheathing behind the Hardi, then you could even drill a through hole in the Hardi and then use stainless wood screws into the ply. The mollys though will be the strongest.
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Harmlessly passing gas in the grassland away;
Only dimly aware of a certain smell in the air
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