Hi Margaret,
Children's marriage certificates, should state, if the parents are alive or deceased.
The year of 1813, on the Henry ATKINS, 1888 death registration, is taken from the age on the death certificate. The age must have been shown as 75. The Ancestry computer system, calculates the year of birth as 1813.
I could not see anything in the papers for an ATKINS, 1888 death.
The registration place on the Vic BDM's database, matches with Melb*.
The age doesn't seem to match, for your man.
Mary