I mean like, it'd more or less make sense there would be some sort of core due to Magnetic and Atmospheric pressure as well as volcanic eruptions, recycling of rocks and earthquakes so I would assume something similar to this idea would be relevant. I doubt it'd be hollow like what mythologies proclaim and I don't think it'd be cold either.
But it's not like we're ever gonna know for sure, so it's all up for grabs really.