That sounds like much but in reality less than 10% of all war material used by the Soviet military in war. That alone shows the scale of fighting on the East Front which is unprecedented by any means.
It doesn’t in any way means lend-lease was insignificant but it wasn’t critical.
The reality is the German military was mostly defeated in the East as early as winter 1941 before most of lend-lease stuff arrived.
The 450K wheeled transport gave the Red Army an advantage over the horse drawn Wehrmacht that it could never cope with. Without them the Red Army may never have been able to exploit their victories. Also by 1943 40% of German war production was going to air defense of the Reich. A result of the day and night bombings by Bomber Command and 8th Air Force.