The US army says that lend-lease and the invasion of Europe shortened the war. It does not say that the Soviets would have won without the Allies being in the war. Even your source says that the lend-lease and the invasion, even if not the deciding factor, were “a great help”.
The source very clearly states that western effort shortened the war, but did not fundamentally change the dynamic of the war. Maybe work on your own reading comprehension?
The US army says that lend-lease and the invasion of Europe shortened the war. It does not say that the Soviets would have won without the Allies being in the war. Even your source says that the lend-lease and the invasion, even if not the deciding factor, were “a great help”.
Maybe read your sources a little better?
The source very clearly states that western effort shortened the war, but did not fundamentally change the dynamic of the war. Maybe work on your own reading comprehension?