I think you could call it a MILD or a DILD, probably leaning more towards DILD because you said your mantra once instead of repeating and trying to fall asleep to it.

More importantly, though -- Does it really matter? You shouldn't get too caught up in terminology and limits of specific techniques: you did something that got you a lucid dream, try to find out why, and then do it again. You'll often find a lot of different variations/definitions for the popular techniques, so beyond a basic descriptive level, the name of a technique doesn't matter that much. The most important thing is to figure out what works for you, whatever name you give it.