Good question.
Obihai products were previously stocked and sold by some Amazon Europe sites. However that seems to be no longer the case. That it is all products and has been for about a year suggests that it is not a temporary out of stock situation. Don't know if Amazon decided the sales volume was insufficient to warrant stocking them or if Obihai has abandoned overseas sales. I note that the few Obihai products listed on Amazon Australia are from other sellers, not Amazon.