Usually the POTUS reserves these types of pardons until their final days in office. So when he said he would do it on Day 1, yeah that's a bit sus.
Why? He can't be re-elected so it doesn't make any sense.
He has billions of dollars in his personal account and I think he just wants to go down in history as a great president. So I wouldn't be surprised if Rossa is released from prison after his inauguration.