Do I need return flight proof for the nomad visa.

Standard tourist ETAs strictly require proof of a return or onward flight. However the one year Digital Nomad Visa is fundamentally different because it grants long term residency status. When you enter the country with the officially approved nomad visa documentation immigration officers generally do not require you to show a return flight ticket as the entire purpose of the visa is to allow you to live on the island for an extended flexible period.