Wrong. They did a planned and phased withdrawal over a period of several months.

Unlike Biden's Saigon 2.0 shambolic exit.

No they didn't. Militarily is was a clear and easy win. Politically it made no sense after a while and USSR decided to leave. Militarily they could have continued staying there for the eternity. The same situation as with the American/Nato forces, with the difference of Soviets controlling significantly more of the country than Nato (only major urban centers, a small part of the country).