Ha. no, it's up to these dancing monkeys to prove they need any such thing in the first place. What it really boils down to is giving law enforcement another way to intimidate and harass people. You know that any decryption scheme is just going to end up as some sort of general use tool that every nut who likes to rifle through people's phones for no reason other than voyeurism will have. Because emergencies. Too complicated and time-critical to need to get a warrant or take it to some theoretically more tightly controlled decryption office.
Considering that they were apparently not ready to just seize the phones, anything is reasonable to offer, and i don't think she showed up with a planned and researched "dodge". She merely said she would prefer to speak to the phones' owners about it, and that is seemingly too much trouble somehow for them.
How i long for the good old days when cable was throttling users because they over-sold internet in an attempt to monetize extra bandwidth on their lines, but not actually provisioning anything more on the local loops.
Stopping it from happening might be a bit safer than potentially finding out it is happening. The informative nature of Huang's hack is still useful, but yeah, journalists in fear of their lives may want to simply grab a Faraday wallet or bag that would cover the phone.