I mean the problem with making evacuation part of the withdrawal would have been that doing so would have been to, effectively, admit that the US fully expected the Afghan government to collapse very quickly (and probably would have speeded up the collapse). Wouldn’t have been great OpticsTM (and whilst it’s a fair comment to say ‘screw the OpticsTM’, OpticsTM unfortunately plays a massive role in these things).
As the article points out the main problem was a slow processing of visas. Per NyT they had a backlog of 17,000 applications on Jan 20th and has been processing 100 a week, that is it would take 3 years just to process the backlog, even assuming they wouldn't get any new during this time.
With that in mind, "making evacuation part of the withdrawal" probably refers to hugely speeding up the vetting process. And to keeping enough military, until the evacuation is done. It seems unlikely, it would contribute to collapsing, nor to bad Optics
TM.
Fairly clear imo, it has never been about Optics
TM, just bad judgement re:situation in Afghanistan. Plus that nor Biden, nor Trump are shy about that [the situation in] ME/Afghanistan is not anything they give a f**k.