I, as do several other growers, have stopped using perlite, hydroton, or any other added product and just use straight coco with great success. Yes autopots recommends these things, but we were the one using them for cannabis, they were growing vegetables.
i talked to jason ceo of autopots on the phone from the UK and he said for cannabis he recommends peat based medium over coco, for newbies anyway. Also corresponded with another high level guy who obviously wasnt growing veggies. But most great grows I've seen are 100% coco. But i kind of like a 50 50 myself right now. I went from all coco, to partial coco, to 50/50 coco/peat and its my best grow so far.
Got to love all the different options one has for growing. Never a dull moment. And you can try and copy someones technique all you want, but there are still variables.
Great of you to net out the basics from Hansbricks for the OP. Kudo's man.