The Jambu is not yet gone, but its well on its way.
Never plant a dried out rootball. If they do dry out prior to planting make sure you put them in a bucket of water with a wetting agent and liquid seaweed or other root tonic, until the root ball is well wet before planting. The rootball can easily turn hydrophobic if you plant it after drying out.
Ordinary Jambu are tough though, and as long as the stems are green there is a high percentage chance that it will come back just fine.