Retirement tax questions

I’m CONFUSED!

 

Someone said elsewhere:

You have until the due date of your 2020 return, May 17, 2021, to repay any portion of your covid distribution and have it count for tax year 2020.   You are not required to repay the covid distributions, but you can.   Be sure to enter any 1099-Rs you received before you file.   You can file an extension which gives you an extension to file, but not to pay your tax bill.   That still has to be done by 05/17/21.”