He’s right that, from a Jewish perspective, being a good person will be sufficient to earn salvation if you are not part of the Covenant.
He is actually saying that to protect gentiles from a much more difficult path.
However, without the Christ, even the Jews would be lost. No salvation through Christ means no salvation. It’s because of the Christ that Jews can keep the Covenant and experience salvation.
The old Covenant no longer applies because Jesus is the new and everlasting Covenant.