"To that end, Xiaomi has turned to MediaTek to power the Redmi K80 Ultra rather than Qualcomm."
Before CN's Xiaomi Redmi K70 Ultra (non-CN's Xiaomi 14T Pro) was powered by MediaTek's Dimensity 9300+, so nothing has changed.
Following the guidelines, the previous CN's Xiaomi Redmi K70E (non-CN's Xiaomi 14T) with MediaTek's Dimensity 8300 should lead to a newer CN's Xiaomi Redmi K80E (non-CN's Xiaomi 15T), powered again with MediaTek's newer Dimensity 8400.