We were discussing how much Greek admixture there might be in Egyptians of the Hellenistic Era, an era of which you seem to know very little in terms of its history. Didn't stop you from making dogmatic statements which are impossible to verify, as usual.
So you found a book by a Classics professor which seemed to support your position.
Actually, the place to go if you want to find out the genetic make up of Egyptians in the Hellenic and Roman Eras is to population geneticists, not Classics professors who are purely guessing.
It seems you forgot the paper which tested a 1200 year transect of time in an area near Fayum, Egypt, including the period of the Hellenic conquest.
See:
https://www.nature.com/articles/ncomms15694
Verena J. Schuenemann et al, with Wolfgang Haak and Johannes Strauss.
"
Our genetic time transect suggests genetic continuity between the Pre-Ptolemaic, Ptolemaic and Roman populations of Abusir el-Meleq, indicating that foreign rule impacted the town’s population only to a very limited degree at the genetic level. It is possible that the genetic impact of Greek and Roman immigration was more pronounced in the north-western Delta and the Fayum, where most Greek and Roman settlement concentrated43,55, or among the higher classes of Egyptian society55. Under Ptolemaic and Roman rule, ethnic descent was crucial to belonging to an elite group and afforded a privileged position in society55. Especially in the Roman Period there may have been significant legal and social incentives to marry within one’s ethnic group, as individthuals with Roman citizenship had to marry other Roman citizens to pass on their citizenship. Such policies are likely to have affected the intermarriage of Romans and non-Rniomans to a degree55"
Their findings support my conclusions on the matter, based on an understanding of the social relations between the different ethnic groups in Hellenic Egypt, which was that while there was probably some admixture between the Egyptians and the Greeks, it probably did not reach significant levels. In fact, they go further and point out a fact of which I was unaware, which was that once the Romans took control, there were even some civil impediments to inter-marriage, even with regard to Romans.
I'd also like to point out that I don't appreciate your constant misrepresentation of the things which I said. This is a case in point; I never said that I thought there was no admixture in this instance. I SAID: there might indeed have been, but given the situation socially and culturally, I doubted it rose to significant levels. I leave the dogmatic statements of certainty with regard to what happened in the past to you.
I would also point out that what you do continuously is use the social mores of the last few decades as a template for everything which happened in the past. That shows a complete lack of knowledge of history. You also judge all people's actions by your own or those of your friends. Again, I never said nor implied that all Greeks of the diaspora practice endogamy TODAY. I said: it probably depends very much on the area, i.e. the number of Greek-Americans, when they arrived etc. As with historical social behavior, it all depends on the unique circumstances of the individual situation. In terms of what I observe around me, many still practice endogamy, although some indeed do not. As another example from other immigrants to the U.S., the Northern Italian migrants to California at the time of the gold rush disappeared within a few generations as a disparate ethnic group. Why? Partly because they were a few among a sea of Anglos. However, if you go to Howard Beach in New York even today there are a lot of Italian-Americans of 100% Italian descent. Why? Partly, no doubt, because there are tens of thousands of Italian-Americans in one small part of one borough.
What I find disturbing is that you seem to look upon people who choose, for whatever reason, to marry within their own ethnicity with contempt.
Stop drawing vast generalizations to fit your political persuasions. There's also nothing wrong with taking pride in one's ethnic identity.