Hyper Gliding in Mario Kart 8 Deluxe

This video describes a technique in Mario Kart 8 Deluxe whereby you can achieve a greater range of mobility and speed than normal while in the gliding sections.

I've never seen an English-language video which documents any of this, so here we are.

TWD98 video referenced:    • Reacting to Every Mario Kart 8 Deluxe 200c...  

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A few additional thoughts based on the comments:

1. I have tried testing triple stacking motion glider + D-pad + stick, but I don't think this actually does anything. I think there is a limit at which it maxes out.

2. AFAIK this is not the same as glider vectoring. My understanding of glider vectoring is that it refers to a quirk with how the forward and horizontal velocities are added when gliding, which results in diagonal motion being faster. That does not require motion or D-pad gliding to perform. The technique this video is describing is basically motion glider, but without needing to use motion, so I called it something else.

3. I've seen it stated in a few places that the D-pad maps to gyro. While there may be some level of truth to this, there is also a distinction. Completing a race using primarily gyro controls will give you the wheel icon on the score screen, but driving solely using the the D-pad will not.

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Here is also a related video from the Japanese community which was created several years back, but doesn't seem to touch on all of the GameCube controller (or gyro-less controller) stuff:
   • 【超・超・超マニア向け】マリオカートのバグ技についての研究発表をする日本代表キャプテ...