False showcase of archery ability on boss battle?

So I pulled for the archery 5 star and I really like the ability.Yesterday I finished the new main quests and I guess I found it weird that we had a battle that was meant to showcase the ability of the new outfit and it was completely better than it actually is?

I don't remember exactly the numbers but from the ultimate ability I think a slime that has 30 life doesn't die completely and in the boss showcase she did like at least 100 damage.So I was confused because the numbers there don't match the actual gameplay experience or the damage you are actually doing. Idk if there are buffs on boss battle's or something else I'm missing in regards to this but if I'm not and it's just a predatory marketing strategy well that would honestly suck.