The partnership between TSMC and Intel is solidified through the transformation of the Fab 12 P8 / P9 center in Baoshan into a fully fledged production site with an independent team serving Intel. TSMC thus ensures that the Intel and Apple production lines stay separate and designs remain confidential.
https://www.notebookcheck.net/TSMC-changes-3-nm-production-plans-in-order-to-accomodate-Intel-s-CPU-orders.592521.0.html