You already got what you need to know from there lol. Toei recently said they made up some of the fighting styles for Shanks and the RHP as Oda didnt give them enough info or something, maybe half of it?
You're not missing out on Film Red tbh. It has some nice moments and great music in places but my god it was also just so fucking daft and a massive bait/let down/hype ruiner.