We'll never know. This is Biden's 100%, because he came into office and scrapped Trump's plan in place and timeline... and instituted his own. Once that occurred, regardless of what perspective you have on the situation, it became his.
Also, all our enemies know Biden won't do shit. They had no idea what Trump would do, and that bit of an unknown variable works as a deterrent. Everyone knows Biden is a pushover... it's why you see things deteriorating not just in Afghanistan, but in numerous other regions and situations.