Boiled linseed oil is because the additives make it look like boiling - this contradicts the article but I believe the article is wrong. One of the traditional additives was lead, but even the modern lead free versions are not all that safe for food unless the manufacture claims otherwise (most don't)

You can still get actual "proper" double boiled linseed oil. It's not even especially expensive, just mildly annoying to source. It's a surprisingly durable finish for outdoor furniture etc, just takes an age to cure compared to the chemically boiled linseed oil.