Which Script is used in this video?

 From:  Koi
10951.1 
Hey guys, got a short question:
I´ve tried a YT surface modelling tutorial, but I don´t know, which script is used.. Can you help me?
You can see it at this timemark:
https://www.youtube.com/watch?v=ClQPiE0P-EY&t=362s

He changes the curve, but I tihnk, itßs not the normal Rebuild function..

Thanks ! :)

Greetings, Koi