Hyper grace doesn't teach we can't sin anymore. It teaches that it's contrary to our new creation nature in Christ. We know people who are in Christ CAN sin, but the focus of Scripture is why would you want to? The focus is on walking in newness of life now that we are dead to sin.
Romans 6:1 1What shall we say then? Are we to continue in sin that grace may abound? 2By no means! How can we who died to sin still live in it? 3Do you not know that all of us who have been baptized into Christ Jesus were baptized into his death? 4We were buried therefore with him by baptism into death, in order that, just as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life.
What does newness of life mean to you? To me it means, the old is gone, the new is here...
2 Co 5:17 Therefore, if anyone is in Christ, the new creation has come: The old has gone, the new is here!
What is the old that has gone? Us. What is the new that is here? Us in Christ.