His anecdote is not sufficient to refute the claim that 9 times out of 10 you should cooperate with LE.
The user probably is a mushroom abuser, given the fact that they are a self-proclaimed marijuana abuser and have expressed interest in Psilocybin mushrooms.
These are two separate things, his anecdote probably being a lie makes his argument look worse but it is not necessary to show that it is insufficient. It would be an incorrect argument based solely on the first point.
I personally just find it humourous and incredulous that he supposedly spent 2 weeks in jail, because he totally wasn’t using Psilocybin mushrooms. You know Shiitakes are huge and pretty hard to confuse with Psilocybin, not to mention the fact that you can test them pretty easily. (They are also in tons of grocery stores, so it’s not exactly alien to everyday individuals).