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It may get it updated quicker.
I would start the GW campaign to have it removed. I know they typically do not but I know they do. I have seen it on the forums.
Yes, it is legit but I would personally wait. You know what disputes can do.
I dont see any issue of an inaccuracy in their reporting upon which to even base a dispute.
They have, in fact, stated that they will update their reporting in their normal course of business.
Sending a dispute that lacks an assertion of an actual inaccurcy in reporting can be dismissed without any need for reinvestigattion by the CRA as being "frivolous or irrelevant." It imposes to 30 day reinvestigation period.
Even if the CRA chose to process the dispute, the current "inaccuracy" in reporting would be overcome once they receive the updated reporting of paid.