Presumably both Time and PBS obtained consent! I thought it less likely that a HN commenter had received explicit permission to reproduce, and just wanted to make sure poster didn't get in any trouble. But really, I was just making a dumb joke about conspicuous displays of power, wherever they may come from.
If it makes you feel more comfortable, here is instead a reproduction by PBS: https://www.pbs.org/wgbh/americanexperience/features/reagan-...
and another by Time, including an image of the original handwritten letter: https://time.com/4473625/ronald-reagan-alzheimers-letter/
neither of which include the encumbrance that the Reagan Library added to their copy.