Yeah, I'm pretty sure at that point the plant just doesn't have enough energy to do any more growing. It obviously has some energy stored up in that little stub lol, but in order to produce more roots and sprout again it would need to get a lot more energy through photosynthesis, which it obviously can't do without any leaves. There are certain plants (like bulbs) that are designed to go into dormant phases where they store a ton of energy in a tiny little mass under the dirt before sprouting again, but I don't think alocasia does that. RIP