Earlier quoted context omitted.
what is the significance of the insurance file hashes no longer matching the files?
None - they never did match the (encrypted) files. WL commented on this conspiracy theory earlier today, both saying Assange appreciates the concerns that he's dead, and saying that "obviously" the hashes are for decrypted files, not the encrypted ones: https://twitter.com/wikileaks/status/798997378552299521
X : X is not compromised.