You can see the movement lines of the blades and the blades being cut at notches, rather than being broken against some sort of barrier. This isn't an argument I want to get into, because it is so ludicrous, and you are only fooling yourself.
Enma helps train emission and control, of course it would help with learning barrier.
Enma helps train emission and control, of course it would help with learning barrier.

He claimed he gave him a chance to escape his barrier which implicates he probably created a barrier first and then pulled off this which is an attacking stunt.
You are confusing the two moments. I know he attacked Hyozou but he first seemingly gave him a chance to escape which is not what he does in this panel, he talks in the past.
And Enma won't let you necessarily learn Ryou at all, there's no evidence supporting that. It might be the case at best that it can help via training empowering one's haki to the point they can learn. It's not an automatic process though.