Justice Matthew Downs said in his decision public protection was the highest priority and “given the risk posed by Mr van der Plaat, an order is necessary”.
However he said because of van der Plaat’s dementia and his age a 10-year order would be “excessive”.
He instead opted for a five-year extended supervision order commencing December 21.
The order included strict conditions such as not being allowed any device capable of taking photos or recording images, to attend counselling and to stay at the same address with a curfew between 10pm and 6am.
He was required to wear a GPS tracking monitor and was banned from going anywhere that children under 16 years old were likely to congregate, such as a park, school, beach, museum, childcare centre or library, unless he had written permission from a probation officer.