Apple doesn’t list it amongst the compatible Mac models. Does it maybe have to do with the GPU of the Mini? Or does Apple believe users of the Pro Display would automatically have something like a Mac Pro? It does run on MacBooks however. Weird…
It came out a year before the Pro Display and has a rather poor GPU. The Mini really is the 2018 model, nothing has changed except the price and the elimination of the 128GB storage tier.
You do have the option of adding an external GPU to drive the Pro Display, however.
Apple doesn’t list it amongst the compatible Mac models. Does it maybe have to do with the GPU of the Mini? Or does Apple believe users of the Pro Display would automatically have something like a Mac Pro? It does run on MacBooks however. Weird…
A Blackmagic eGPU can give you 6K via Thunderbolt 3 connection.
An eGPU with a Navi type AMD GPU can also give you 6K via USB-C DisplayPort Alt Mode connection (Moshi bidirectional USB-C to DisplayPort cable). The W5700 has a USB-C port (use with USB-C cable supporting USB 3.1 gen 2 and DisplayPort) so you can also get the USB features of the display (brightness control and presets).
Thunderbolt 3 connection via external GC-TITAN RIDGE is not working yet. Needs code to enable PCIe tunnelling of non-Apple Thunderbolt 3 add-in cards (maybe possible soon...). This could allow 6K + USB 3.x with any Navi GPU. Possibly needs firmware flash to support dual HBR3 connection for 6K when not using Navi GPU.