Is Unitus dead?
Depends what you mean by dead. The network works and you can set up a new wallet or node and it will find peers. (DNS Seeders seem to be down, but at least the fixed nodes are backing it up and functional)
Is it being actively promoted ? Maybe not as much as stakeholders would like.
But it's a good coin, and its operational
Operational isn't enough and since there is no development anymore I would say it's definitely dead.
It's sad but it has 0 future potential.