I feel like “official acts” would be something like, say, if say a former president died while the US military was attempting to secure confidential documents being stored at a golf resort, the sitting president wouldn’t be charged with murder, however, if you were to say, incite a riot and Order an elected official to defy election results to push the election that you clearly lost in your direction, you would not be protected. Since you are working in your own interests, not the interests of the country.