This is a good set of suggestions for improving in chess that obviously worked well for the author. When I saw how great his results were, though, I suspected that he must have been pretty young during his improvement phase, and sure enough, he was a teenager. Rapid chess improvement, like language acquisition, is a lot easier when you're young. So if you're an adult, don't be too disappointed if this regimen doesn't shoot you up to 1800 in a year. I know many adults who have been playing the game seriously for decades who never got there.

(Context: I have been an 1800-rated adult myself who recently got up to 2000 with a lot of hard work.)