It’s hyperbole. I don’t think you can die from consuming them (don’t quote me on that, guess it depends on dosage).
I would think you get a bad tummy ache when eating them raw and maybe liver damage and/or a nutritional deficiency long-term.
Bread might get hot enough to break down the tannins. I just always thought beechnuts taste better ;)
Boiling also works to make acorns edible consumable less lethal. They still taste kinda bad though.
Of course it can. What did you expect?
Depends on the version. All of them (the newer ones with networking) have TFTP. Some even have HTTPS. I think HP Servers even have HTTPS-Boot with client TLS certificates.
None of it works with Wifi though. iPXE has wifi support for some devices but you obviously can’t start it over the Internet. You need to flash a ROM you don’t need or use a USB drive to load it. Then you can boot Linux from the Internet. (That also works if you don’t have a UEFI Shell in BIOS). https://netboot.xyz can also boot other OSes than Arch.
It might also be outside the environment.