Is the Ivory-billed Woodpecker extinct?

I've talked about this species before, both in the context of the search for it in the last 10 to 15 years, and with respect to a poem of mine that was, in part at least, inspired by it.

This article doesn't really take things any further, but makes the point that there are still ornithologists who hold out hope for it, and who would prefer it wasn't declared extinct (not least because if there's at least a chance of it still being alive, there's an additional reason to preserve certain habitats).