The underlying problem is that a request for early exclusion is a request that the CRA grant a voluntary exclusion at an earlier date than that requried under the statute or under their normal processing.
It is not an assertion that the information is inaccurate, and thus there is no basis for a formal dispute.
Some CRA reps will incorrectly ask if you wish to open a dispute when you request an early exclusion.
That can result in admin problems, as there is no "investigation of inaccuracy" that is then being conducted by the CRA.
The post states that it is unclear as to whether a formal dispute was opened by the CRA, so any issue of whther it is resolved cannot be determined.
It is possible that the rep simply granted the requested early exclusion, and no dispute was formally opened.
Hard to tell.