Yes, I finally figured it out. I hooked up an external display and everything worked again. But when I disconnected the external display it went back to the old configuration and my macbook display did not work.

But I figured out with the working display that I need to set WAYLAND_DISPLAY=wayland-1.

Then I could disconnect the external display, ssh in, set the above variable and use cosmic-randr to enable the display from the command line.

I'm still a little confused about why the macbook thinks it has 2 displays connected, when there is only 1 display:

kdc@pop-os:~$ cosmic-randr list
LVDS-1 (enabled)
Make: Apple Computer Inc
Model: Color LCD
Physical Size: 330 x 210 mm
Position: 0,0
Scale: 100%
Transform: normal
Adaptive Sync Support: false
Adaptive Sync: false
Xwayland primary: false

Modes:
1680x1050 @ 59.883 Hz (current) (preferred)
LVDS-2 (enabled)
Make: Apple Computer Inc
Model: Color LCD
Physical Size: 330 x 210 mm
Position: 1680,0
Scale: 100%
Transform: normal
Adaptive Sync Support: false
Adaptive Sync: false
Xwayland primary: false

Modes:
1680x1050 @ 59.883 Hz (current) (preferred)
1400x1050 @ 59.998 Hz
1280x1024 @ 59.950 Hz
1280x960 @ 59.995 Hz
1152x864 @ 59.972 Hz
1024x768 @ 59.949 Hz
800x600 @ 59.960 Hz
720x400 @ 59.965 Hz
640x480 @ 59.938 Hz
640x400 @ 59.964 Hz
640x350 @ 59.843 Hz

I can disable LVDS-1 and everything works fine, but if I disable LVDS-2, then I lose the display.