I've asked this question too but with zero response. We are due to fly AKL-SIN-ZRH-ARL at the end of March with a week in SIN but with the number of cases growing daily we are now really worried about routing through SIN and staying over as there's no telling how the number of cases is going to expand. I know it's still 6 weeks away but plans need to be made, I don't want to get to one week away and be told that routing through SIN is no longer possible due to the threat level. Also, if the threat level increases then the final destination countries may well institute measures to restrict arrivals from SIN.