I took it more as him pointing out that while Trump, right or wrong, is crucified in the press on a daily basis Obama was able to successfully spin a benevolent image to the point that he was absolutely held to a different standard. All presidents have blood on their hands, but there is a certain irony in Obama being the first Nobel peace price winner to bomb another peace prize winner.
To your second point, I think the sheen of Obama's Presidency is definitely beginning to fade a bit. His failure to truly effect change in the Arab Spring showed amateurism in foreign policy. If there's any irony, it's in the Nobel laureate selection process (at least for the Peace prize); Kissinger won the damn thing in 73, which should tell anyone that the whole award is a farce.