I think the video has some myths and misconceptions about soil. The rocks at the bottom do not help drainage, they make perched water problems worse.

Personally, I do not like vermiculite because it disintegrates into a glittery mess.

I agree with ewwmayo.

Also, the soil will retain too much water and will likely result in root rot unless one is very careful about watering. This is a mix he suggests for citrus, which is very susceptible to root rot. Many people kill their citrus in soils like this because they do not know how to water them properly. This is not a mix for someone unfamiliar with growing citrus.

Thanks all!

And, the video has no CC so it is sort of worthless to some of us not to mention that apparently he likes too show his face too much too.