Low Density, No Orient Profile Guided Sweep

Hello Guys
Yesterday I watched this Video and I really shocked with result. Firstly As you guys watch, after sweep He/she has very optimized Surface, low control points count. now compare to Normal Sweep2 in Rhino. Mass of unnecessary Control Points.
Secondly, No need to orient profiles on Rails. just choose where you want to put.
Thirdly, Profiles knot connections are very smooth.
I really appreciate if help me to understand how we can make this.

https://www.bilibili.com/video/BV1rz411e7DQ/?spm_id_from=333.788.recommend_more_video.0
https://www.bilibili.com/video/BV1Ro4y1976n
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