It seems to me Lynch is confirming what your son was told - they want something they can make the whole industry do.
Unless they mean “We just need Apple to write the software one time, and then we can decide whose phone we can break into and when — but we promise we’ll never do it without a warrant! We’d never do it based on the owner’s politics or do it to our ex-girlfriend’s phone! You can trust us!”
“The FBI has been claiming they just need Apple’s one time help.”
Nope. That’s been debunked and the truth is that it’s more than just one phone.