If true the guy probably already had naturally excellent Dream recall and experienced very vivid Dreams, with this combination it takes very little effort to get Lucid.

I had them two things naturally and took to LDing like a duck to water as soon as I read about them, having my first on the third night of trying.
It took me quite a lot of practice though to start getting them every night but I was getting a few a week from the very beginning.

Maybe this guy's just even luckier than I was with it.