@Geo
Okay, let's look at the spoiler again:
Robin got a flashback of Koala teaching her the Fishman Karate while Sabo taught her Ryuusouken and the conclusion of this flashback is her brand new attack "Thousand Fleur Karate Gigantium". So why exactly did you draw the conclusion that Sabo caught Robin Haki, when he merely taught her the Dragon Claw Fist?
Also, her Demonic Fleur isn't the new technique for which she had her flashback.