What he's described in the podcast is sensible, but my vivarium is larger and my soil layer much deeper than the ones they discuss in the podcast. They don't advocate the use of pelleted fertilizer, but I do. Not using fertilizer is part of why they don't recommend external drainage. I keep parsons and there's no way I could have my set up without pumping out the water. You need to decide what your limitations are based on:
Will you be using slow release fertilizer?
How much will you be misting?
How deep is your soil layer?
What plants are you growing?
I advise you to have a means to drain excess water away, whether you use it frequently or not, it is a fail safe. I drain my viv twice a week. If not, after a few weeks, the water reaches and saturates the soil layer and leaks out of a hole that OF COURSE would be in the rubber liner, after ingestion thousands of dollars and many hours putting the thing together, meanwhile, someone on YouTube is useing garbage bags and water proof duct tape, with no leaks for 6 months!!! Sometimes, I'd like to punch life in the gut, and again in the face, it's doubled over!
By the way, ECUADOR IS INCREDIBLE!