Interesting. I'm virtually certain there was nothing about it in the NAR question pool in 2009. The L1000 wasn't certified until May 2014, and I can't find the TMT cert documents online to see if TMT tested the delay times or not. Certainly Aerotech said at the time and AFAIK continues to advertise the motor as having an adjustable delay.
Look, I'm not trying to be a jerk here, and the rule is a reasonable one (though I don't know how NFPA came up with the L threshold for it.) But imagining that everyone reads NFPA 1127 with a fine tooth comb, or studies revised L2 questions years after they get their cert, or reads all the well-intended safety guideline documents, doesn't fit with my experience at a typical launch.
Used to be, or so I remember, that the Safety Code was pretty self-contained. The more we add elsewhere and incorporate by reference, the more likely something will slip through the cracks. FWIW, I can't find this anywhere in the NAR HPR Safety Code, which only mentions 1127 in the context of mass launches, but it is in the NAR question pool.