Absolutely incorrect indeed! The option to e-file 2019 and later has been published in articles from turbo tax and irs respectively for over a YEAR. In addition ive seen various tax professional forums state they have done it for their clients using intuit pro series as well as the general versions
https://www.irs.gov/faqs/electronic-filing-e-file/amended-returns/amended-returns
https://turbotax.intuit.com/tax-tips/amend-return/how-to-file-an-amended-return-with-the-irs/L6kO691...
