So Zoro used Armament haki to cut Daz bones.
By extension this means Zoro also use armament haki in Skypiea to cut Ohms sword since it was stated multiple times time so be As hard as steel
But the difference is Zoro used An "air slash" to cut Ohms sword. Meaning he used an invisble haki projectile attack to cut
Now let's go back to Hyogoro's training. When he decides to demonstrate the Barrier haki attack for Luffy he says Ryou is used by swordsmen to cut steel. But all throughout the training, at no point did Hyogoro demonstrate Ryou with a sword for Luffy because Luffy wouldn't need that.
If Armament hardening is extensible from Coating your body to coating your sword and then advanced armament is projecting Haki literally off your body then for swordsmen Advanced armament Haki is projecting haki in form of a sword slash
And that's exactly what Zoro did in Skypiea. He projected haki with a sword slash.
By extension this means Zoro also use armament haki in Skypiea to cut Ohms sword since it was stated multiple times time so be As hard as steel
But the difference is Zoro used An "air slash" to cut Ohms sword. Meaning he used an invisble haki projectile attack to cut
Now let's go back to Hyogoro's training. When he decides to demonstrate the Barrier haki attack for Luffy he says Ryou is used by swordsmen to cut steel. But all throughout the training, at no point did Hyogoro demonstrate Ryou with a sword for Luffy because Luffy wouldn't need that.
If Armament hardening is extensible from Coating your body to coating your sword and then advanced armament is projecting Haki literally off your body then for swordsmen Advanced armament Haki is projecting haki in form of a sword slash
And that's exactly what Zoro did in Skypiea. He projected haki with a sword slash.
Are you saying:
1.Air slashes utilize barrier haki by default (a function of how they work)?
or
2.You can imbue haki into them (and that is what Zoro did in Skypiea)?
Seems to me you're saying the former (option 1)