Hello,
No, you asked for how-to setup a loopback network adapter and I gave you a way.
That won't work for connecting your VMs.
However you don't need it either.
As I was not working now I just plugged the network cable here and made sure that WiFi was disabled.
If you got your VMs in host-only networking then you CAN also access the host via the address as you can see for vmnet1 when running ifconfig in OSX. There is no problem, it should just work.
--
Wil