Does the one carry-on with the dimensions you describe mean that you no longer carry an orange bag on the flight to McMurdo? Or is that separate? Or is this referring to the size that your orange bag must compress into?
If they’ve eliminated the orange carry-on bag does that mean you have to provide your own carry-on bag and that you need to wear all your survival gear (instead of stuffing it and all of your heavy stuff into the orange carry-on bag)?
As for the Pole common use computers, Brian Shunamon and Mike Ray did a great job getting things set up last winter. There are also card readers available.