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SoC in this case is a system on a chip - despite the "a" it's abbreviated the same

Probably see SBC's used more as a term for them than SoC's as they incorporate more than just the die (imho)

Well, except once you have a PCIe daughter card it's no longer an SBC; you have at least two boards right there.

No but it is before you add one, so that's the best place to start.

Not necessarily. If this is based on a CM4 (almost certainly), then there's no SBC at all since the CM4 is a SoM.

Yes and there are dozens more than just the CM4 that have it embedded... on a single system board.