I have had to use that guide twice now and initially had the same issue. The method I had to use was #2 where i manually edited the host file. You have to "trick" the program into thinking you are looking online at LG servers for the update. If the host file isn't correct it will actually connect to LG and tell you are up to date.....at least that's my understanding. Took me a while but I eventually got it to work.
Since I don't see any more comments here am I to believe you cannot, at this time, root a LG-D801 that is running Android Ver. 4.4.2, Kernel Ver. 3.4.0 without reverting to a previous Android Version?
I have done this and keep getting a blank white screen after phones screen powers down. Also went into a boot loop after I tried to flash a Rom. Is it do to bootloader still being locked?