@yungish Yes, the IRS will accept an e-filed tax return if the original tax return was e-filed.
But TurboTax will not e-file a prior tax year amended return.
As stated in the link you provided -
Not all tax software providers support electronically filing amended returns for other than the current year. If not then you will need to file your amended on paper and mail it to the IRS.
Also see this TurboTax support FAQ for e-filing amended returns - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/e-file-1040x-amend-return/L9t...
Note this statement-
However, there is a chance your return cannot be electronically filed. If this happens, you'll need to print and mail your tax return.
