The discussion around deadnaming and necessary or legal record keeping is kind of ongoing, but that's not what's happening here.
The point of rules like this is to dissuade deceptive name changes but there's no reason to view this particular case as deceptive. That's why it's going up for review and not disqualifying them immediately. Ideally, Congress would recognize this case doesn't fit the spirit of that rule and both allow them to campaign while simultaneously setting a precedent or rewriting the rule to exclude deadnames.
As to whether that'll actually happen, and how fair and impartial the review will be, I think we can all guess it won't be.
It's an understandable rule, but this is dishonest enforcement of it.