Per Michael Tsai:
What really happened is that Apple loudly proclaimed that they had made it impossible to comply with government data requests and even had a marketing page masquerading as a privacy page explaining that. The FBI asked Apple to put a build on a phone that would allow them to brute force the passcode, leaving the device and the build on Apple’s premises the entire time. This showed that Apple’s claim was false in practice. Apple quickly removed that marketing page in the wake of the news.
An interesting perspective I had not previously heard.