"Not quite. In re Arawn presents a test: is the decedent's use of a mind-controlled undead army because they can't bear the possibility of disobedience-- Lawful-- or is it because they can't or don't want to set up the structures that would allow them to use ordinary soldiers-- Chaotic. The Abyss argues it's the latter. The decedent's use of Chaotic species such as orcs provides further evidence.
"In re Flagg points out the central issue at hand. Taking over the world is Lawful Evil if and only if the decedent attempts to establish rule of law, meaningful state capacity, a civil service, or otherwise a 'genuine state.' The decedent reliably showed no interest in establishing a genuine state. Areas he ruled continued to select their own rulers in the traditional manner, except that Tar-Baphon killed the rulers if they didn't provide tribute. His primary influence on the life of the peasants was allowing orcs and undead to maraud without consequence."