Yeah this article is kind of annoying. I've started foraging for mushrooms in the past few months and I've never found a morel but I know they're poisonous when raw. It even says so on wikipedia: https://en.wikipedia.org/wiki/Morchella#Toxicity

There are plenty of gaps in knowledge about mushrooms, and there's a lot of unknowns about the ecology of morels but plenty of people eat these all the time.