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Impact/Ice abilities such as Icy Hammer don't decrement Glacial Shell when used. Not sure if this is actually a bug, but it feels weird to have a demon (Alma) with two hybrid Ice abilities and a passive that seems like it would work perfectly with an Ice hybrid build, then have the passive work in such a way that it's no better than it would be with a pure physical build.

Not a bug: as you guessed, they aren't triggering a reduction because they're Impact abilities, not Ice abilities. Most "introduce a mechanic monsters" tend to not use the mechanic particularly well to give you a chance to adapt to the new thing. Alma do have Flash Freeze, which reduces the cooldown for Glacial Shell.

Thanks for the report regardless though, still good to know this is a bit confusing. I'll see if I can find some way to clarify it a bit.