No review checked states whether the guidebook offers a reversed meaning for its sun, moon and eclipse cards, and creator Patsy Bennett's own product page for the deck, read directly, is silent on card orientation as well.
What would resolve this The deck's own guidebook, examined directly for a stated position on reversed cards.
OpenDeck design and cartomancy practicePatsy Bennett and Richard Crookes, Zodiac Reading Cards, Guidance from the Sun, Moon and Stars (Simon and Schuster official page)