As someone from East EU, this is actually plausibly accidental, though the timeline is suspicious.

Mushroom foraging is cultural, you can buy foraged mushrooms in farmers markets and in general it is a fairly popular leisure activity to go foraging in the woods.

I hardly know anyone over 50 who isn’t excited for the mushroom season, sometimes people do end up picking up a death cap as it can be mistaken for a couple different edible ones at its various stages of growth, though you have to be fairly inattentive to do so. That said we treat a couple of poisonings a year in our toxicoligy ward.

How many of those die due to eating the mushrooms?

Around 100 registered over the last 10 years, that comes in to about 0.5 per capita per year