ASML and other non US comoanies can continue to supply SMIC. ASML CEO reiterated that during the last earning call. The fact that ASML has not shipped the EUV tool to SMIC is because the Dutch Government has not granted an export license. That is a political decision as the Netherlands was under intense US pressure and has nothing to do with the blacklist. I think only a political intervention from the top, i.e. chairman Xi, can unblocked the delivery.
The rule that no company can sell to Huawei if the good concerned contains any US technology was very ecceptional and was only for Huawei. Hope this clarifies..
Its happen before entity list come into force. If you read US accusations, SMIC in collaboration with China military industrial complex. Then its fall under Wassenaar Agreement. Of course only advance node under 10nm. Judging SMIC managed to make nodes under 10nm using DUV tools, Its God send gift to US to block SMIC. As we know US can make rule out of thin air, anything is possible.