Incorrect. Commutation of a sentence already served is is not meaningful or "appropriate" for any purpose other to dodge dealing with the obvious: D’Souza is qualified to seek a pardon — someone who expressed remorse for his actions, and who fulfilled the terms of his sentence properly. Given that the original charge was inflated, mostly political, and/or the punishment excessive then pardoning is the ONLY recourse those who have completed their sentence.
D'Souza was clearly targeted, his offensive elevated to criminal rather than civil, and given the circumstances the sentence very excessive. It is very rare for someone to be charged with violating this law, but apparently other(s) got a much lighter charge and sentence:
"a prominent Los Angeles attorney, Pierce O’Donnell, pleaded guilty to
misdemeanor charges of making $20,000 in donations to the presidential campaign of former Sen. John Edwards and reimbursing straw donors." He was sentenced to 60 days in jail.
https://www.reuters.com/article/idUS219614372520120301