In fact, we don't know. What do know that the plan that Trump set up with the Taliban was garbage, at least if you think we never should have agreed to a total withdrawal (most wanted all out, theoretically anyway). Still, the truth is, Biden did not have to go along with that agreement. He could have either breached it or rejected it on the grounds that the Taliban we're not meeting their obligations under it (few as may have been).
Who knows if Trump would have gone through with the full withdrawal, and in the manner that Biden did. There's no reason to think that he would. On previous occasions, when he had the thought of a complete withdrawal, he listened to the generals and intelligence recommendations and didn't.
In any case, the last opportunity to not f*ck this up was entirely P. Biden's. Seriously, it's irrelevant and lame to speculate about what Trump would have done by way of attempting to excuse or mitigate Biden's ineptitude, incompetence and misplaced priorities.
Biden said the buck stops with him. We should take him at his word. Attempting to shift the blame to Trump is pathetic, whether you want to characterize it as juvenile trolling or high-minded political deflection. In your case, I'm going to go with the former rather than the latter.