Shadows interaction with cadence and flow

I did some testing. It appears that shadows using shadow cascade do not inherit/use the damage buff of lethal cadence passive oder the flow passive.
Does this imply that the ability used by the shadows does a) not count as me using the ability and b) does not inherit my stats at the moment of casting the ability?

To specify: For excample the lethal cadence passive provides +100% increased dmg to the third ability used. If the third ability happens to be shadow cascade AND i have some shadows up, then the shadows DO NOT get the +100% increased dmg buff.
Since the shadows are supposedly clones of the played and NOT minions this is counterintuitive.
Same happens with the flow passive or the guarantees crit from the pulse passive.

I’m simply looking for confirmation on wether my observation on this is correct? Do shadows not synergize with momentary damage buffs?

edit: spelling