"He maintains that he does not recall his offending," Williams Blyth said.
"He took their word for it. He took what they said at face value."
A psychologist who saw Heazlewood in 2018 said it was implausible that the man would not be able to remember what he did, given his level of cognitive functioning and his recall of other matters.
The prisoner was described as "compliant and well-manned" while behind bars, but the board noted he was also untreated.
"The board encourages Mr Heazlewood to develop a safety plan and work on his release proposal.
''Mr Heazlewood should also give some thought to being released to places other than Dunedin and South Canterbury," Williams Blyth said.
Heazlewood will next come before the Parole Board in August.