Yes, but the quoted statement from etotheipi suggested the possibility that the fragmented-backup format might yet change between testing version and release version. That ambiguity hasn't been removed by a clear statement, although it seems unlikely that the format is going to change given how close we are to release of a new non-testing version.
I think he was making reference to the new paper backup format, exporting only the root key instead of root key + chaincode. M of N backups were not available to public at the time of that post, if memory serves right.
Regardless, the current M of N backups are only available as part of test builds, you're better off waiting for a release build before shoving the GDP of Zimbabwe into one of those babies =P. You're welcome to abuse them with cheap change or testnet coins, however.