Nope. The government does not have to disclose investigative techniques. If Apple wanted to help the government, they could have, but they chose not to take that tact. Expecting the government to help Apple now is folly.
Apple could not.
Cellebrite could.
I get what you're saying, but this is having your cake and eating it too. Apple chose not to assist. The FBI found someone who could. Why would that company then have to disclose to, basically, a third party (even a third party inventor of the phone) their standard work product and trade secrets?