Not true. They are now allowing it. Per the IRS:
"If you need to amend your 2020, 2021 or 2022 Forms 1040 or 1040-SR you can now file Form 1040-X, Amended U.S. Individual Income Tax Return electronically using available tax software products."
"You can amend tax year 2020, tax year 2021 and tax year 2022 Forms 1040 and 1040-SR returns electronically at this time."
