US inflation is higher than other wealthy nations and the US also did a larger stimulus. So there is evidence that the additional stimulus may have created greater inflation in the US. Scope this paper here: [0]
As far as the consensus for the cause of inflation being unclear among experts, scope this article in left leaning VOX: [1].
[0] https://www.frbsf.org/economic-research/publications/economi...
[1] https://www.vox.com/23036340/biden-american-rescue-plan-infl...
But not the QE/printing money.
Canada gave a lot more in stimulus checks (with respect to GDP) than the US but is experiencing less inflation than the US.
https://www.cnn.com/2021/03/03/economy/budget-2021-uk-stimul...
One other person I saw mentioned that the reserve requirement was lowered to zero in 2020. I don't think that has ever been done before.