The "refutation" and "lack of re-refutation" have no more status than the original rumor. For hobbyists, this might be enough. For many professional purposes, it does not suffice.
PBL
This looks to be an official note on the incident - I think someone already posted it ealier:
CEN10RA135 Note the date of the incident - it's pre iceland VA.
I doubt there have been two uncontained failures like this on the same type in less than three months (or rather, if there had I think it would have been bigger news and we'd know).
PBL: From this incident note and your professional contacts you may be able to confirm the details and tie in the photos - in which case the date and location rules out VA.
This may be as close as the rest of us amateurs get to an official statement (reported statement form Cessna):
Engine Damage Not Caused by Volcanic Ash: AINonline.