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Sounds reasonable to me.

But also what the fuck happens to the core of such a planet when that happens?

We aren't actually sure what gave our core the spin it has, right? I'm not fully awake yet but I think it's plain where I'm going with this.

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It's not plain to me where you're going. But the answer about the core of a planet engulfed by the sun is that it vaporizes eventually, just not right away.

> We aren't actually sure what gave our core the spin it has, right?

We are, it’s from the conservation of angular momentum. The material that made our planet also had a non-zero angular momentum.

No we aren't. That's a theory that barely fits the lower bound of what we estimate the spin of the core to be

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