It's like that saying about mushrooms: "All mushrooms are edible. It's just that some mushrooms you only get to eat once."
Anyway, edible normally means "safe to eat," not just "possible to eat." (As you are no doubt aware). IIRC, Elmer's glue is considered safe to eat though not necessarily appetising.
Surprisingly the doctors involved quickly identified mushrooms as the culprit, despite that the 75% died.
https://en.wikipedia.org/wiki/Leongatha_mushroom_murders
It was a super interesting court case.
Did she really expect to get away with that? It seemed so obvious and her attempts to not be culpable were terrible.
Reading that, there's a strong implication she tried to poison her husband once already, and that information was not allowed into this case!
Also, apparently she inherited $2 million?! Actually it's a little weird that she gets a page long "Early life and background" style section. Lots of public people have shorter ones. That's somewhat uncomfortable.
Is it edible? Yeah, it is eatable.
Here I am, years later, learning I was right all along.
I believe that the stereotypical "craft food" is actually paste, which is often based on starches like corn or wheat. Children are very likely to put paste in their mouths and try eating it, because it is indeed based on food products.
I've frankly never been in a school that provided a lot of paste, and the switch to Elmer's glue may have been a strategy to stop kids from consuming the food-based stuff. However, I was in a summer science course where we crafted "Oobleck" which is also sort of "edible" if you like eating clay that's been squeezed between the filthy little hands of 8-year-old boys.
