I meant the Z Flip 6. Not the fold. The folds have always had fully supported DeX.
The Flips did not have a DP-capable USB-C port until the Flip 5, and still did not support DeX due to thermals. But the Flip 6 has it with a developer option, but only the "new" DeX.
Sorry for the confusion on my side. I thought of the Flip as the OP mentioned the Motorola Razr which is positioned against that, not the Fold.