There are a lot of oddities to this text but I’m not sure that’s where the focus should be. Yes, it’s weird how many points are addressing Jesus being a ghost. Yes, it’s weird that Jesus is given broiled fish. From a narrative perspective these just make sense. There are only a few explanations for how a man who was killed could be alive again. Either 1) they’ve begun to lose their minds, 2) Jesus is a ghost, or 3) his words could actually be true, and he could be risen from the dead. He has flesh and he has bones, and they can touch him. He is eating in their presence. His words must be true.