

Iirc it is the russula that is commonly confused for the deathcap and its variations (amanita) people usually report feeling like they have confused for amanita. The russula is a very common one to forage and I can kind of see the resemblance, but I also have not encountered an amanita that is too convincing at passing for russula, at least to me, especially if you actually look beyond the cap. So realistically you are right, I don’t really feel like you could forage the wrong one with experience, but people from all different backgrounds still manage to do it with a certain regularity, which is why I say this is plausible as an accident. It feels like too much work and they would probably have to cook the medical record since he was probably in the hospital for a bit before he died (yea, two weeks).
At leadt in my language, hunting is not generally used in other contexts, so I can see why someone wouldfind it funny, maybe.
Also, chanterelles are an absolute staple, probably the most common one. Others are russula and boletes (this one being the favourite for people generally). Some others commonly picket are milkcaps and parasols (personally their resemblance to deathcaps makes me uneasy).
Deathcaps could be confused for Rusulas, some milkcaps and parasols.