All mobs with routes can see silent move.

ShinichiYao

NpcKnownList.java

// Support for Walking monsters aggro
protected class TrackingTask implements Runnable {
    @Override
    public void run() {
        if (!getActiveChar().isAttackable()) {
            return;
        }

        final L2Attackable monster = (L2Attackable) getActiveChar();
+       if (monster == null) {
+           return;
+       }
+       if (!monster.isAggressive()) {
+           return;
+       }
        if (monster.getAI().getIntention() != CtrlIntention.AI_INTENTION_MOVE_TO) {
            return;
        }

        for (L2PcInstance pl : getKnownPlayers().values()) {
            if (!pl.isDead() && !pl.isInvul() && pl.isInsideRadius(monster, monster.getAggroRange(), true, false) && (monster.isMonster() || (monster.isInstanceTypes(InstanceType.L2GuardInstance) && (pl.getKarma() > 0)))) {
+               if (!monster.canSeeThroughSilentMove() && pl.isSilentMovingAffected()) {
+                   continue;
+               }

                // Send aggroRangeEnter
                if (monster.getHating(pl) == 0) {
                    monster.addDamageHate(pl, 0, 0);
                }

                // Skip attack for other targets, if one is already chosen for attack
                if ((monster.getAI().getIntention() != CtrlIntention.AI_INTENTION_ATTACK) && !monster.isCoreAIDisabled()) {
                    WalkingManager.getInstance().stopMoving(getActiveChar(), false, true);
                    monster.addDamageHate(pl, 0, 100);
                    monster.getAI().setIntention(CtrlIntention.AI_INTENTION_ATTACK, pl, null);
                }
            }
        }
    }
}