No, so Skylark is a fully integrated thing designed for non-technical people (atleast that is the hope). Thats why it puts out an Access Point right out of the box, and is easy to use. On the flip side, to ensure that it remains that way, its deeply tied-down - you can't install packages, can't customize it beyond what is in the UI, etc etc.
Armbian for DC is just a standard (Debian) Linux OS for DC. It doesn't create an access point out of the box. If your heartbeat led is working fine, that means Armbian booted fine and is up. To use it though, you need to log into it (atleast for the first time) over serial or usb-serial. usb-serial is easiest, so I will describe it:
Connect the DC to your Linux PC with a microusb cable (usb-type-A on the PC, microusb connector on the DC).
Let the DC-with-armbian boot fully - the heartbeat should stabilize (meaning blink at a steady rate).
Now you can connect to it using something like picocom
picocom -b 115200 /dev/ttyUSB0
If you don't see anything, press enter a few times in picocom.
I believe you can use Putty in Windows as well, but I have no experience with that.
But, to cut the long story short - Armbian is different from Skylark, and used differently.
This doc gives a few more details.
Edit: should have mentioned - Armbian does not receive outernet. It is there so that the DC can be used as linux development board with an integrated rtl-sdr (sort of like plugging an rtl-sdr into the Raspberry Pi and using it with Raspbian).