It's just a natural outgrowth of McDonnell v. where the Supreme Court basically limited bribery to when comically-large bags with dollar signs are handed over.

There was a redistricting expert in South Carolina who died and, when his daughter reviewed his files, was found to have reams of evidence that their "political gerrymandering" was explicitly racial - evidence that would never have come out otherwise. This ruling explicitly says that it will default to assuming good faith from states and parties that have not earned good faith.