What's left is an artist who sets up the contest organizers by
• happily accepting the selection of his work on his website a month before the event (without a mention of intending to refuse the prize),
• then literally the night the before the event, publishing an "open letter" about refusing the prize on the website,
• and finally, showing up uninvited on stage to make his speech about refusing the prize.
This is a clever way of increasing his name awareness by riding the AI art controversy wave, for sure.