Ok, I think I see where the confusion is. NPC's stats don't follow character creation rules. Nemeses sorta do, but henchmen and minions certainly don't. The wound thresholds for NPCs should be whatever they need to be for the purpose they need to serve. This is basically true for every other stat in an NPC block as well.
This may be a break from what a lot of players & GM's may be used to. That statement is making the blanket assumption that "a lot of players & GMs" previously played WotC games where designers applied full blown character creation rules to every entity in their game universe, from the lowliest kobold/jawa minion to PCs to campaign nemeses. That practice makes a lot of sense in some ways (consistency of rules), and is completely nonsensical in others (NPCs serve a variety of different roles, which are all exclusive to the roles of the PC).
Whoever made the design call on this part of EotE probably thought the latter explanation was more relevant than the former.
The "issue" that it leads to is that without some play experience, it may be a bit hard for some GMs (especially new ones) to appropriately balance encounters until they get some experience running the game under their belts. Notice also, that we don't have any inidicators (Challenge level, difficulty ratings, whatever) to benchmark encounter difficulties. It's on the GM to determine the numbers and quality of the opponents in their encounters.
Probably wordier than it needed to be, but does that help clear things up?