Both. Plus it’s partly a Dog and Pony Show (“there’s a new Sheriff in town”).
Here’s the law that governs this, if you’re interested:
https://www.govinfo.gov/content/pkg/...l/99-17327.htm
Considering that there are open court cases and open investigations related to the redacted portions, I don’t think Congress will get their wish? There are two Defendants whose names are redacted that we don’t even know about, yet, so they have yet to be indicted or their indictments are being kept secret. Defendants have gag orders in the current cases. This is to protect the Defendants, for a fair trial (impartial juries).
Also, there’s NO intelligence in this report; just a note saying to see the intelligence agencies for said intelligence. In other words, Mueller is telling the AG and Congress to talk with / subpoena those agencies re said intelligence and counterintelligence.