Using a windows-server-2008-r2 I added the print-management role to it.
Using that, I added a new printer
and attached it to a currently set GPO
Assuming I done things right, looking at the linked GPO - I see the correct values
In the past, I used the pushprinterconnection.exe to set a printer as default.
Q: Is that STILL the way to set a deployed printer as default?
You can't do it through Deployed Printers. If you use Group Policy Preferences then you can choose which printer is default. Give that a go instead.