I think they’re referring to the how to make a tiktok style edit tutorial video on the Youtube he linked. It’s pretty good, ngl, although i’d much rather than fade out, overlay the alternative clips by a few frames, then fade out and in usinc either cubic out/cubic in, or a combination of exponential and cubic. Gives it a more seamless transition imo.

it’s high quality (afaik) if oyu get from Tidal or Deezer (if Deezer works at all, worked before but it’s now haing some issues as of late), Lucidia also is a bit unstable as of late but when it works it’s a nice little site