Call me cynical and/or bitter, I’m not really in a position to deny that today; but apologizing now for something that happened in 2014 and has already been more or less roundly denounced and apologized for seems more like luxuriating in your perceived importance than sincere contrition.
In order for an apology to matter on what’s approaching a ‘historical’ timescale; at least the transgression, if not the transgressor, have to matter on a similar scale.
Maybe I’m being too hard on the guy, and it really does eat at him at night; but from the perspective of the public this seems rather less like a relevant apology and rather more like that guy drunk-dialing his ex who is long over him to make a maudlin apology for being garbage while they were together; frankly unhelpful and overtly about the apologizer rather than the apologizee.