I have a D6000 that i just tried with a M1 Mac Mini. What a pain. First of all, everything seems to be working on the dock just fine except the displays. I already went to Display Links website and downloaded the 1.3 Update that has Native M1 support. I thought it should be plug and play then. But no. You have to launch the software it installs first and add a Screen Recording permission (which is how Display Link works, or at least how it works in Big Sur). Then theres a utility that runs in the Menu Bar. You can open that and say to Run At Login. But theres a catch. It doesn't work at Login which for a Mac Mini is a problem, for you might not be depending on your use case. Either-way they have a link to install the Login Screen Extension right there in the utility. That works. The only other issue i have is if i shut the computer down. Turn it back on. I have to reseat the cable to get it to negotiate the Displays again. I suspect this kind of problem might not immediately present itself to laptop people or people that never turn their computers off.
Honestly the only reason i'm using the D6000 right now is cause i brought the M1 to work to finish setting it up. Once you get it setup it works just like my 2017 15" MBP does with Display Link and the D6000. Its mostly for Office work stuff.
Sorry for the rant, but yes, the D6000 works with M1.