I’m guessing there was lots of failures, obvs sharing them isn’t all that interesting to most people, and unfortunately being candid can also back fire. Some people can’t understand the concept of “failure” especially when some plants only have a germination rate of 10% and he also isn’t growing them in their local habitat either, which makes it harder.
Kudos to him though, I’ve wanted to mess around with more plants in aeroponics myself. Maybe even make a pipe wall with some ornamental plants in it.