Correct.
The blessing “No Respite” increases damage against staggered enemies (apparently direct dmg as well as dot), rather than granting a damage bonus to the player when ever they stagger an enemy.
The effect is “+x% dmg against enemies that are staggered”.
That is a passive buff which is always active.
The condition that causes the buff to actually have an effect (enemy is staggered) is a debuff on the enemy.
It would not make sense if it was displayed as a buff or debuff for the player, because the buff part is always affecting the player and the debuff affects the enemy, not the player.
There is a mod that allows you to see the enemy’s stagger state though.
Debuff indicator.