This looks to me like a piece of surface root. That happened to have some downward growing roots. When it was dug up, it was potted high, so that the downward growing roots remained exposed.
The top will sprout.
Knowing Darlene, she’ll keep it potted high.
A “more sensible” person, would score around the bottom of the “trunk” and bury it a bit, and new roots will emerge around the perimeter of the “trunk”, creating a sumo trunk. But Darlene likes weird things, and exposed roots, so, she’ll take the path less travelled and create some monster from the bog thing that in 10 years will become even more gnarley once those roots bark up!
Darlene, once the roots holding the trunk up get a little stronger, I’d find a way to tilt it so it has some movement. The roots gotta be strong, though, olive wood is heavy, so that trunk is going to be heavy.