“Havoc and Malice” is a variant set of paired daggers; that’s how they were meant to work, see also Whirlwind Blades.
Unfortunately the Riders of Hyboria patch cut their damage down so much that they are significantly worse than anything of what used to be the same tier.
What he’s saying is “Havoc and Malice” is really a dagger weapon in terms of the underlying game mechanics, disguised to look like axes. Kind of like the Lying Bastard Sword is really an axe, but that looks like a one-handed sword. There is no real duel-wielding in CE. This weapon, or using an actual axe in the main hand and a throwing axe in the off-hand, is all smoke and mirrors to give the appearance of dual wielding.