No, current US sanctions against huawei says, any entity using US origin technology cannot fabricate Hisilicon chips. While TSMC is not headquartered in the US, they use US origin technology. For example, ASML EUV machines contain US origin tech, or they use Applied Materials, LAM research machines heavily on their production line. I am not sure how deep it goes, maybe even if the manufacturing line uses Intel CPUs also counts. That is for the legal experts to explain. As result, TSMC is under US jurisdiction with respect to this particular ruling. Maybe TSMC can risk it and supply Huawei, but US could retaliate by sanctioning them. At the end of the day, TSMC can't operate without US origin tech; if they can't get EUV machines or LAM machines, they are dead as well. So the choice is clear. And I am sure TSMC wants to be on good record with the US anyway.