Update: after 6 weeks, perseverance, highlighting PDFs of Hawaiian law and news articles demonstrating the enforced illegality of quarantining in a rental condo, and a little luck with a representative willing to listen... I actually did get a full refund!!
I will plan to stay with that host again so that she can be made whole. Maybe even during an off time that the condo might be empty otherwise. But yes, exactly, it would have been a crime to stay there and the host would have been facing a $5000 fine and jail time. And many neighbors in Hawaii were organizing to report any violators.