The st.mk buff, the kunai reload and ex kunai reload, the float buff..
These seem small but watch Ibuki matches at a high level. The kunai buff in particular is crazy good for her , she can. Be a lot looser with them now and that changes her considerably.
Her neutral got better and more threatening without getting riskier and people are just learning to play her better in the first place.
So regardless of how good she is or isn't in your eyes why on earth does it matter that rushdown wants to learn her some to aid in fighting her?
.
Even a bad character can require knowledge to fight against (not saying Ibuki is bad I don't think she is at all).. look at Alex, s1 and 2, he's never been a top tier character by any means, but he will wreck you for not understanding him. That's actually what makes a lot of characters bad in the first place, once you learn the ins and outs they go from god tier to horseshit. blanka in sfiv was like this in many respects and my main in IV Decapre.. she was never horseshit she was redonk but playing vs her when you didn't understand her was just beating your head against a wall.