I noticed the same and wrote to Jolla - answer pending. I still do assume a mistake in the price calculation. The Shop told like: “Order now with the voucher and you get all this with €489, 30% off from the consumer price €699” which for me sounded like exactly what was done with the C2, that this Includes the voucher price - otherwise it is not a voucher at all IMHO.
And the order confirmation told:
“Secure your spot AND €75 Voucher” and “Price €489”, not “Price 564 €”.