Your statement is factually incorrect.
"Almost all male U.S. citizens and male immigrants, who are 18 through 25, are required to register with Selective Service.
https://www.sss.gov/Registration-Info/Who-Registration
"Almost all male U.S. citizens regardless of where they live, and documented or undocumented immigrant men residing in the U.S., are required to be registered."
www.sss.gov Registration Who Must Register
Regards,
One oversight does not render the whole statement invalid.