[alecst]

It's true. It wasn't mushrooms that almost killed me, but what I thought was a carrot. It was poison hemlock. You really can die out there.

It depends on the intentions of the site. If the author is advertising it as a complete guide, then I agree with you: it's incomplete as a guide. If he's advertising it as a starting point -- start with these mushrooms which have a very low risk of harm -- then it's fine in my view.