i think in general the concept may be something new, but this is just more of manipulating the "grab box" for grabbing the ledge because fox and falco's ledgegrab grab box always comes out about near the end and during the initial freefall animation. if the boxes are active and you are not holding directly downward, you will grab the ledge during the times where the grab box is active no matter what angle you take, and this concept has been used for the longest time. specifically the idea of doing the up b from the platform may be a unmentioned topic, it is pretty cool you put this stuff out there so others can get into this new idea of using the up b from the platform, i dont know if theres any safe use for it other than attempting to edgehog with style, or attempt to follow up to some sort of combo as seen in the video, since the startup time and vulnurability for firefox may not be useful as a retreating option, thought still plausable. i'd like to see what people can come up with using this idea instead of just using for style or trying to follow up decently safely