All of the above, complete nonsense.
There was nothing stopping Biden from saying "right, we'll leave in 2022, we'll set up an evacuation process for any Afghan who wants to leave by the time we do" - he arbitrarily decided on being out by September 2021, that was 100% his call. He wasn't committed to leaving by anything Trump did, as evidenced by not leaving in May, it was in his power to move the deadline. All he had to do was commit troops as long as he wanted and there was nothing the Taliban could have done about it.
The irony of saying blaming Biden is done for 'partisan reasons' is absurd and as bad as the Trump MAGA loons deflecting any blame from him.
Biden could have evacuated civilians/refugees before the Armed Forces in the amount of time he wanted to take, be it a year, two years, whatever. He didn't; he pulled the rug under them and thousands will die because of his actions.