It is definitely not a Death Adder. The issue is whether it is a Brown or Tiger. Without a better look at the snake I would have to guess at Tiger. The frontal scale seems as broad as long which would also suggest Tiger
Really interesting. Geoff Robertson and Steve Taylor said it was a death adder. An iNat snake guy swore it was a tiger and the iNat app said tiger. Maybe ask Scott Keogh - ANU herpetologist?