In doing former Pres. Donald Trump's bidding, the House GOP is grasping at straws. They couldn't impeach Biden, so they think they can embarrass him with this audio. Garland won't fulfill their ridiculous request and is the man Trump blames for the federal criminal cases against him, so they attempt to impeach Garland. Claiming executive privilege is the only way Biden can stop the GOP's unprecedented political attacks on the DOJ.
What's unprecedented in this case is the president's claim of executive privilege when there are no confidential communications to protect — everything said is already available in the transcript. This is the elderly president's way of preventing the public from hearing what he sounds like when he's having cognitive issues. The electorate deserves to hear this with an election just months away.