Might be old tech but I figured I would post this. I would have listed it earlier, but I honestly didn't know there was a board for this on srcom.

quick dash was actually found (by me) way back,when the HD version came out https://gamefaqs.gamespot.com/boards/727961-castlevania-lords-of-shadow-mirror-of-fate-hd/67863071

but that double-jump dash is fire, thanks.

I found this independently on my first playthrough with no exposure to outside sources. Intent of the video was information dissemination, rather than to claim the initial discovery.

ChurchnSarge tipped me off that you can just hold the Whip button as well. I find both methods are useful depending on the situation, such as if I am going to be rolling off a ledge.