After the Brazil midair, I surmise that the people in charge had a rethink about the appropriateness of routinely cruising at non-standard levels.
The previous AIP amendment was an attempt to get the message across. One that was pretty obvious, I thought, but which was being routinely flouted in the name of saving a few kilos of gas. But no, those lacking in commonsense ie the enviro-nazis needed more a pointed message, so this amendment is the result.
Safety=1, Environment=2
