Of course, but unfortunately many articles like this one fail to add a note like this to their disclaimers. It's easy to forget during and after the excitement of a mushroom hunt.
I think you're kind of overreacting.
I probably wouldn't have posted a reply if I didn't make the same mistake myself years ago. In my first five years of foraging I was less careful than I was after the incident I mentioned. I have never misidentified any mushroom I've ever consumed and have eaten many dozens of species. However, after getting very ill that one time (violent vomiting and diarrhea) I have become a lot more cautious when consuming new wild mushrooms (heeding to Arora's advice to try small amounts first). In light of my personal experience I found the article to be a bit light on words of caution, especially for novices.