I agree with you it has already been made aware to me on reddit that the invisible wall is probably impassable.

In the next week I'm going to theorize as many shortcuts but I will only post them on reddit If I do complete a shortcut I will post it here. Despite this shortcut being theorized in Mk8U it is closer to working In mk8dx and more than any other Theoretised shortcut that I know of

New shortcut is most likely impossible Best attempt at shortcut

Please attempt this shortcut there are two ways I can see it being possible

I have found if you jump at a certain point it might be possible to jump from royal raceways hairpin to the end of the glider section however I couldn't pull it off here is the link to my reddit post with the video There are two problems with this shortcut 1. Lakitu might pick you up 2. Will...