Looking for video on level design workflows with editor scripting

I am trying to find a specific introduction to editor scripting video that I watched some time ago, maybe someone remembers this one:
I believe it started off talking about editor scripting basics and then continued to develop a level prefab system. So basically using a custom menu a new level is generated which a designer can use as a starting point. This level prefab consisted of the base game logic including player spawn and goal. Not everything was shown off in the video the later parts were just briefly touched to let everyone know what this system is capable of. I believe the whole video was branded by Unity however I could not find it myself - maybe it was deleted. By the chance that someone here remembers this video please let me know

A key component of that system was to check and verify if the new level included specific components required to play through it