This is why people will often make a video recording their intention and their reasoning, and try to demonstrate that they are of sound mind before making the decision to end their lives through a method like this. I can assure you that buying a gun in a country where owning firearms is illegal.. and then shooting a loved one.. is not something that can in any way be compared to an action like this, in the eyes of the law at the _very_ least.
I get where you're coming from about having problems with the tone of the website, and that it doesn't say "this is a nasty way to die, it's going to feel awful". But on the other hand it's trying to push for self autonomy in an area where it's criminalised.
Really laws need to change to give people options.