Yes.
The rule mostly applies to OOC threads where people are sharing their opinions. You are not allowed to create 2-3 accounts and pretend to be other people who just showed up to support your own opinion.
That said. I've seen great success in simply creating a single NPC sub-account to run all of your characters. This works especially well when you have to run a whole factions worth of NPCs and don't desire to create a new sub-account for every welder, nurse, or secretary droid in your campaign. So you just create a single sub-account named "Spirit of the Alliance" or "Narrator of the Sith" and use it exclusively for NPC posts, replies, or one-offs.
Excellent question!
Jyvvii