If you cut off the Apical meristem, for whatever reason, the rest of the plant is still going to want to grow, so it grows a new (or multiple ) Apical meristerm from one or more dormant nodes along the plant. IIRC (I'd like someone to back me up or correct me on this because I'm not 100% sure) , the Apical meristem secrets hormones that keep dormant nodes dormant. No Apical meristem = no hormones.
Think of the meristem os a fetus and it's cells as stem cells. Ok, this is a weird analogy but go with it lol. It's undifferentiated cells can become cells of the protoderm, protocambium, or ground meristem which is a secondary meristem along with the vascular meristem (But don't confuse these with the Apical meristem)
Really the "growth point" is the Apical meristem which is under a few protoleaves that have yet to develope. Think of a banana tree, how the center is really inside the pseudostem. I probably confused some of you just then lol.
Bottom line without fancy explanations is, this is what happens when you whack on a nepenthes! Hurray! You'll have a bushier plant soon. They rarely die from being cut.