I do not know about that. The founder of TSMC is fairly antagonistic towards the PRC. But TSMC has factories in China. The one they have at Nanjing, for example, was inaugurated on October 31st last year. It uses 300mm wafers and can manufacture chips at 16 nm. Even if, for whatever reason, Huawei can't manufacture at 7 nm in Taiwan, which I doubt will happen, Huawei can at least still manufacture their older designs. That would mean they would be using 2 year old designs but at least it is better than nothing.
This is one reason why I think Trump's efforts will fail to kill China's semiconductor growth. He started this way too late. Just look at the date that factory started operations for example. China has splurged huge amounts of money bringing chip factories to China and most investments became operational last year. Plus Trump is being quite blunt and clumsy with his sanctions.
Also, Huawei can simply spin-off HiSilicon as its own independent company. Then it wouldn't be under sanctions anymore. Even if Huawei themselves couldn't use the leading edge chips, HiSilicon could sell the designs to companies like Oppo. Which aren't being sanctioned. This would also help kill Qualcomm in the Chinese handset manufacturer market. Only reason the other Chinese companies use Qualcomm instead of HiSilicon's chips is because they simply aren't allowed to buy them. So it would kill two birds with one stone. If the US then sanctioned Oppo in addition to Huawei then it would make their dirty game obvious to anyone.
Last time the US imposed ITAR on satellites to try to stop China it made European satellite manufacturers develop their own fully indigenous and vertical technology they could resell to other countries without getting in the US's dirty game. That nearly killed the US satellite technology sector. I think Trump is just repeating that mistake again.
Had he done this the minute he was elected it might have actually worked. Now I think it is way too late.
I don't think President of TSMC is antagonistic toward PRC. But they are under incredible short leash by the Taiwanese government. When the chips are done, TSMC is not going to sell to the PRC for the following two reasons. First, TSMC themselves can be put out of business because most of the equipment come from USA. Second, the current pro-TI are looking for any way to curry favor with the America and they can do really bad things to TSMC and its employees.
By the way, this will be a great chance to finally create semiconductor independence for China. But it will involve reducing American equipment as much as possible in the supply chain. But it will need Xi's approval because Trump will not be happy at all.