Filing 2020 tax in 2022 with TurboTax download software

I did not fill 2020 tax last year, so I bought a download version and filled out all forms today. At first the software told me that I cannot use e-filing because it is too late. I wanted to see what would happen if I chose e-filing so I clicked on it. I got to the end without any issues, and now the "check e-file status" section shows that IRS has accepted my return. However, I found it strange because:

1. I didn't get any emails from IRS saying that the return was accepted.

2. I downloaded Form 1040, and for "Federal Return Acceptance Date" it shows 06/13/2021. I have no idea where this date came from because I am certain that I did not fill last year.

3. Technically I think I cannot use e-filing anymore for 2020.

 

Could this be a possible technical error with TurboTax? Did someone else fill on my behave on 6/13/2021? I checked with the track refund function on IRS and they have no information available.

 

Please help me confirm what is happening to my 2020 return. Thank you.