no, it’s still direct skill conversion, “in case you got any of that dmg type”, ex the intention could be the modifier was to be used in different direct dmg build, and devs wanted to make sure it could benefit from additional dmg sources “to that skill” like regular weapon dmg/base weapon dmg
any regular attack skill fits this always
Cadence conversion is even a little extra special if you will, since it only converts Cadence hit itself, 3rd hit, not the two first hits even if it was wps or "blank"white attack - where as other AAreplacer with direct conversion would convert wps “through” the default attack replacer
conversion is only global, when the conversion modifier is attached to a regular buff skill, Pneumatic Burst, Blood of Dreeg, Spectral Binding, Harbinger of Death, Menhir’s Bulwark, Field Command, etc etc, these are global buffs, so conversion modifiers to such skills makes the conversion global too
then you have the “confusing” buffs i mentioned earlier
couple other exists ofc
you also have skills with an on “proc” buff effect, like Deadly Momentum in Cadence, Lethal Assault in Amarasta’s Blade Burst and ofc Soul Harvest in Bone Harvest
^while they themselves are global buffs, since they are part of another skill and triggered “not an individual buff”, not only would direct conversion applied to ex Bone Harvest not confer global conversion to Soul Harvest buff, it would not even directly convert Soul Harvest itself either
more on secondary effect mechanics like Soul Harvest etc here