Incorrect. RSA keys are fine, the ssh-rsa key signature algorithm is not. You can instead use the rsa-sha2-256 signature algorithm with your RSA keys (and you w

Incorrect. RSA keys are fine, the ssh-rsa key signature algorithm is not. You can instead use the rsa-sha2-256 signature algorithm with your RSA keys (and you will have been using this for some time if you are running non-ancient openssh).