To me this may explain another reason law enforcement agencies are upset about the recent changes Apple and Google made that prevent them from providing phone data.

If what the article said is true, it's not that they can't see the data, they just can't use it in court. Part of what the article calls the 'Planned Program Perjury Policy' would likely be to reverse engineer a probable cause to get a warrant for the device then serve the warrant to Apple/Google and then take the evidence to court.