Interesting point of view. I have heard that one a lot. It leads me to wonder why Paul and Peter never got that memo. They continued to live by Torah after His resurrection....seems like a key point that they were not given. If you have questions about their living of the Torah, I'll address them as they come. I don't exactly have time to write them yet.
Just like when Moses was given the old covenant, there was a 40 year transition before it became 100% fully in place. For example, none of the Israelite men born for 40 years in the wilderness were circumcised. Therefore, these men couldn't participate in the feasts, but the men who were circumcised (i.e. Moses, Aaron, Joshua) did.
Same thing with the new covenant. After it was put in place at the cross, the old covenant still existed, but was gradually getting faded out. Hebrews tells us the old covenant was obsolete, and would soon disappear.
Come 70AD, the old covenant came to a complete end, and the new covenant was 100% fully in place.
The NT gets confusing because Peter was preaching to people born under the law, while Paul was preaching to people who never even heard of the law.
To make it even more confusing, Paul at times preached to Jews under the law, and Paul said the following:
(1 Cor 9:20) To the Jews I became like a Jew, to win the Jews. To those under the law I became like one under the law (though I myself am not under the law), so as to win those under the law.
Paul stopped observing the law when he placed his faith in Christ Jesus. Paul was a minister of the new covenant. However, as we see above, Paul at times acted like a Jew and observed the law only to win those under the law.
They continued to live by Torah after His resurrection
See 1 Cor 9:20