When the overall numbers are consistently low. 50% more of the usual extremely low percentage isn't that exciting. It may be interesting to some party strategists perhaps. Its like when they say a record number of GOP women in Congress etc. But when the numbers were extremely low in the first place telling me there's a 50% increase isn't saying much. Improvement sure but at most it highlights how slow progress has been.
As far as AOC, I agree its a good thing to point out areas of improvement in your own party. And it is interesting that she and other progressives can do this and they dont get censured. You see the opposite with the GOP. Nearly anyone of them that has stood up to Stop the steal lies, or calling out insurrectionists, bigotry in their party they get primaried or blasted by their own base.