Well “ancient Egypt” was Greek/Persian/Roman for like a thousand years
Correct
or whatever so probably not many actual Middle Kingdom folks still around
This really depends what you mean. If you mean culturally, linguistically and religiously that is true, but you don't need to reference Greeks, Romans, Persians etc. to know that the culture/language/religion of the Middle Kingdom doesn't exist today.
However, the claim that people who lived in the Middle Kingdom don't have descendants today is wrong. Most Egyptians today had ancestors living in Egypt during the Middle Kingdom (I'm sure many have ancestors from other places too). None of the groups who dominated Egypt historically tried to kill everyone or to force everyone in the region to move out. Without evidence of large scale ethnic cleansing occuring, trying to claim modern Egyptians aren't descended from ancient Egyptians doesn't make a lot of sense.
Correct
This really depends what you mean. If you mean culturally, linguistically and religiously that is true, but you don't need to reference Greeks, Romans, Persians etc. to know that the culture/language/religion of the Middle Kingdom doesn't exist today.
However, the claim that people who lived in the Middle Kingdom don't have descendants today is wrong. Most Egyptians today had ancestors living in Egypt during the Middle Kingdom (I'm sure many have ancestors from other places too). None of the groups who dominated Egypt historically tried to kill everyone or to force everyone in the region to move out. Without evidence of large scale ethnic cleansing occuring, trying to claim modern Egyptians aren't descended from ancient Egyptians doesn't make a lot of sense.