Your citation states continuity with additional ancestry mixing in from later migrations:

>The study stated that "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 [native] population only to a very limited degree at the genetic level."

Yeah, modern Egyptians are directly related to ancient Egyptians, with the biggest change being that they have significantly more subsaharan DNA than any of the tested ancient Egyptians.