I'm not so sure. I've listened to Comer talk about it, and apparently the DOJ was hosing their investigations refusing to release subpoenaed documents that they needed to legally close the deal shut around Biden. But had they succeeded in impeaching Biden out of office, he would have been replaced by Kammy, who would have had the exact same people telling her what to do calling the shots and she's an even bigger idiot.
That would have made her the incumbent, with unlimited time to prepare reelection, develop a perfect campaign strategy, and with full media support behind her. That would have only increased her chances of being reelected.