this incident was long ago, and i have no data (medical reports, autopsy results), and i am also no expert, just opinionated!
but consider this scenario. ian muller was not bitten at all, or bitten by a harmless animal, or bitten by a snake that did not inject its venom, and the antivenin killed him. this is a distinct possibility.
even if he had been bitten, antivenin is snake specific, and the story admits that the snake was never identified. i was taught, if bitten, you must kill the snake, and bring it to the hospital. i was also taught that no serum should be injected until signs of poisoning are evident, except for the adder family, in which the window is short, perhaps as short as 10 minutes.
yes there are poisonous snakes in the wild, and i have seen plenty, even nearly stepped on a puff adder, who reared up, hissed twice, and let me go. snakes are hardly the biggest danger in the berg, or anywhere. lightning is far more likely to kill you, and hypothermia even more likely than that, and i am sure my list is very lacking, and of course stupidity is probably the greatest danger of all (i'm ribbing myself here!).
mr. miller's phobia meant he carried antivenin - i never do. the trouble with antivenin is that it is a powerful toxic drug. i know i do not have the expertise to administer it and monitor the effects. so i take the calculated risk that snakes will leave me alone, as they are want to do. so far so good!
last, snakes and other wild creatures add to my enjoyment of the berg. i certainly love seeing snakes. they get the heart and mind a-fluttering.
keep a good lookout for all snakes, then jump for joy (or to get out the way) when you see 'em!