I hate to sound negative. But what is being produced is largely irrelevant in the context of what is being delivered. Secondly, what makes you think it is "minor QC" issues, maybe other than just hoping that is the case? We are talking about 1000s of cars piled up, with 100s more getting added to the pile every week. Doesn't make any sense. Either production is lower than what we think it is or the pile of cars is just getting worse. None of them bode well.
Minor or not I believe the issue(IF there was an issue) is either resolved or Tesla is confident it will be resolved very soon. I doubt they would open up configuration to China unless they are sure they can build and ship them to China within the expected delivery time frame. If there was still an unresolved issue or an issue without clear path to a solution, I would imagine Tesla would hold off opening configuration to China esp after how one owner reacted to long delays.
To your point, I agree that produced vs delivered is irrelevant, although... what if the part in question is a 5 minute task per car that can be installed in the holding area? Tesla can keep building Xs without the part that can be quickly installed later rather than not building any Xs at all. It is better to keep building them without a single part as long as the part can be installed without putting the finished Xs back on the assembly line.