I just checked some in inventory and think it's a matter of translation. Although designed in Canada these are made in Germany and all the marketing materials (what there is) also comes from Germany. We copied and pasted from the manufactures site.
That said I think they are being very literal in that the key can not be removed when "turned" to the unlocked position however if you turn the key back 90 degrees thus re-engaging the lock mechanism internally the key is removable prior to re-engaging the lock plunger.