If the sun expands to a diameter that includes at least one human, does that count as "falling"?

Do digital ems or heavily augmented cyborgs count as "human"? What about a being who is genetically engineered from human cells but whose genome is further from the average human genome than, say, chimpanzees are?

If the sun expands to a diameter that includes at least one human, does that count as "falling"?

Yes.

Do digital ems or heavily augmented cyborgs count as "human"? What about a being who is genetically engineered from human cells but whose genome is further from the average human genome than, say, chimpanzees are?

These count as long as the resulting entity seems to have a conscious experience similar to that of a human.