I don't know your network setup, so I can only guess: AFAIK, LEDE has a default address of 192.168.1.1. I don't know if a DHCP server is even active at first boot, i.e. before the initial config has been done. Also, I think that in the LEDE default setup, LuCI is not contained. So you may have to tweak your LEDE configuration.
I can assure you that my modifications do in fact work. I assume that you'd have the same problems if you would try to setup another hardware type with LEDE. I use the very same modifications for my own product HomeTunnel, albeit with a given network setup and additional software.
As you can see, Giuglio did manage to get it going after initial problems as well, so I doubt that there is a specific problem with my modifications.
Remember: your PC keeps the assigned DHCP address for as long as it was obtained, so I would rule of the DHCP part altogether by assigning an IP of, say 192.168.1.3 to your PC and trying to access http://192.168.1.1. That is, if you did not forget to reconfigure your PC from the 192.168.0.225 address you had to use to initially flash the device.