I don't deny that. They don't necessarily make you stronger in combat as well. That is what a powerup is to me. These are new techniques that the character integrates into their repetoire. That's like saying G3 Grizzly Magnum is a powerup for Luffy because he didn't show it in FMI while he showed it in PH. They are new techniques that these characters can add into their arsenals.
However as I've stated earlier; Gears, Enma, Kyutoryu, Diable Jambe and Raid Suit are the powerups. Not the techniques.
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Did you read Alabasta? Honest question.
He gained the ability to cut whatever he wishes to cut because he can
hear the breathing of that material. Him cutting steel is a feat, he did not gain an ability that allows him to
only cut steel, he could cut anything and everything that he wanted to. Obviously that ability was retconned into Ryou in Wano and was nerfed with Haki being introduced.
And ofcourse it's a powerup since Zoro himself acknowledges that he's stronger now.