Uh, no. They haven’t. Some bozo found Arabs with the same names and claimed they were the terrorists on the planes, but that’s like finding someone named D.B. Cooper in the U.S. and saying that it’s the guy who hijacked the plane and parachuted out the rear with the money. . . Except this D.B. Cooper ain’t him.
Do you realize how many Arabs share the same names? Their names are Mohammed ibn Akhmed ibn Alman al-Jalmani. That in English is Mohammed son of Akhmed son of Alman from the town of Jalmani. And every third Arab is named Mohammed or Akhmed.
The more recent researcher I’d read had gone to extensive lengths with family members etc. to determine that the living folks were really the claimed hijackers.