As I said in another comment, LPR or not, it seems totally scary to me that a visa was revoked because the company committed a minor mistake in filing the notification: for all we know, the company filed the notification in a timely manner but sent a superfluous check with it that caused the document to be returned.

In what world is this something that shouldn’t be considered a minor mistake and be looked past by an immigration officer, considering that the company was in good faith? Hell, the guy didn’t even change employer, it was a simple change of address for the same company!