Have you already explore here? I think you need to explore this place first and talk to Tao again. By the way, you still can't go to Island in this current update (0.44).
I've explored to that point, but when I speak to Tao, there isn't a new prompt to ask him about the island. Regardless, if the place isn't available in 0.44, I'll bide my time. Maybe I'll try opening the Country Road, but if that means interacting with Arion (I intensely dislike that character), then I don't have much of a choice.
Thanks very kindly for the reply!