You are right, it was an extreme recommendation - for someone who complained that his trips weren't extreme enough!
The dosage depends on the shrooms - a single dose for ******* shrooms (stopharia) is 30 grams. The dose for ******* philosopher stones is 10 grams. I double the dose (or more?) if I want to have a REAL trip (means I'm staying home, preparing to dive deep into the unconscious...).
On 20g of the ******* philosopher stones I recently had excellent visuals (everything was glowing, burning orange). An hour or so later I had an out of body experience for a few moments (the feeling that you are now leaving your body, like when you're dreaming, but you're still awake...)
I wouldn't call it "halluzinating" neither (you can only get real halluzinations on stuff like belladonna or maybe dmt) but I'd say that for someone who complains about their shroom trips being too shallow they should give it a try - after such an experience you won't complain (and you'll be glad there were no real hallucinations going on...)
I have to add that I don't smoke weed, but I always drink some alcohol prior to the trip (makes me very resistant to bad feelings, so I can up the dosage a lot
)