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The insuracne company is not the party who furnished the reporting to the CRA of the late.
Their admission to responsibility should reasonably be basis for the creditor deleting reporting of the late, but that is between you and the creditor.
The CRA will likely view as an admitted late, and thus no inaccuracy. You are seeking good-will deltion, not a showing of inaccuracy of the reporting.
I would place a call to a manager on their executive staff and explain the situation. A wooden desk will likely show more concern, and has the discretion to grant exceptions to any normal "non-deletion" policy.
I would try to take it up with Harley Davidson with the documentation...and get it to an EO.