Yes, the Mac Mini Dock of ours is fully compatible with the new Mac Mini with Apple M2 Chip. Please see below for the speed test results.
Testing SSD - WD Black SN770 SSD
Testing unit - Mac Mini with Apple M2 Chip
Testing program - Black Magic Disk Speed Test
Test Results - Write 2306 Mbps / Read 2767 Mbps
Testing SSD - WD Black SN770 SSD
Testing unit - Mac Mini with Apple M2 Chip
Testing program - AJA System Test Lite
Test Results - Write 1990 Mbps / Read 2795 Mbps
Testing SSD - WD Black SN770 SSD
Testing unit - Mac Mini with Quad Core Intel Core i3
Testing program - Black Magic Disk Speed Test
Test Results - Write 2139 Mbps / Read 2232 Mbps
Testing SSD - WD Black SN770 SSD
Testing unit - Mac Mini with Quad Core Intel Core i3
Testing program - AJA System Test Lite
Test Results - Write 2560 Mbps / Read 2513 Mbps
Just connected my new M2 Pro Mac mini to the TB3 Mac mini Dock, using WD Blue SN570 2TB SSD. On BlackMagic am getting ~2760 MB/s for both read & write. Read about some reliability issues Samsung has been having with the 980 Pro SSD so returned that before even opening it, and I think the SN570 performance thus far has been great.