I don’t know that he got accused of that. But he did bring it up as a hypothetical.
The amazing answer to the question is that Grace would indeed abound, but so would chastisement, for the Lord chastises those whom he loveth.
Romans 3:8 Why not say—as we are being slanderously reported as saying and as some claim that we say—”Let us do evil that good may result”? Their condemnation is deserved.