Description for Skill Gem Ice Crash of Cadence with Unarmed

In the skill gem Ice Crash of Cadence description says:

`Requires dual-wielding Swords, Maces, Sceptres, or Axes to use.`

But in game you can actually use the skill when have active Hollow Palm Technique.

I think maybe the description needs to be more clear, or it just a hidden mech?

Looking at ActiveSkills through community tooling, both the regular and transfigured skill gem has the same full set of ItemClasses restrictions.

The transfigured skill gem has an additional ActiveSkillType of DualWieldOnly that restricts it down to roughly what the description says as it rules out all the 2H weapons, but it doesn't catch the Unarmed case.

Is there any stat in the game that allows you to count as dual-wielding despite holding a 2H weapon? If so, that could explain the entries for the other weapons but Unarmed feels like an oversight.