Dude, he's right.
This isn't 10 seconds either because it takes way longer to get the visuals.
DILD you already have the visuals and just suddenly realise you are dreaming so become lucid instantly. It just takes longer from when you start dreaming. Unless you get lucid a few second after your dream begins.

I think the question is when do you start timing from? What says this is 10 seconds? Is it from the time you lay down to the time you enter the dream? Or the time you start getting visuals to the time you enter the dream.