No. Dimensity (MT6891, MT6983, etc.) still uses the same VCOM preloader protocol. However, you might need the updated driver from SP Flash Tool v6.24 onwards.
...one might ask: is the MTK USB Serial Port Driver x64 still relevant? mtk usb serial port driver x64
Even with the correct MTK USB Serial Port Driver x64, things go wrong. Here's the troubleshooting hall of fame. No. Dimensity (MT6891