A statement said to have been issued by Willis recently appeared on Deepcake's official website, in which he apparently spoke about his deepfake appearing in a European advertising campaign.
The actor was said to have seen it as a "great opportunity for me to go back in time", and he allegedly added: "With the advent of the modern technology, I could communicate, work and participate in filming, even being on another continent. It's a brand new and interesting experience for me, and I (am) grateful to our team."
Dad-of-five Willis was announced to have retired from acting career in March after he was diagnosed with aphasia – characterised by difficulty with language or speech.
It is usually caused by damage to the left side of the brain, responsible for understanding and producing language.
The news he was retiring was revealed through a post shared to his daughter Rumer's Instagram account, and which was signed by several of his children and family members, including his former wife Demi Moore.
They said his aphasia was impacting his "cognitive abilities", adding: "This is a really challenging time for our family and we are so appreciative of your continued love, compassion and support... as Bruce always says, 'Live it up' and together we plan to do just that."