Departing Mexico City airport with permanent resident - YES

I left ZIH for Canada via MEX a couple of weeks ago. I tried to do the migración process at ZIH, but understandably was told to do it at MEX.

The migración desk was at a kiosk. I left from Terminal 2. I used the migración kiosk near Sala K. There were numerous signs with arrows for migración.

The process took maybe a minute. There was no paperwork, just a scan of my passport and permanent resident card and a stamp in my passport.