The first link is solo groove-based, and in the 2nd the harpist is playing what sounds like a written out accompaniment to their own melody. (Or even if it's improvised it's a kind of ostinato pattern.)
Ok, that third link is a harpist actually comping. Boy, that's tough! The pianist has to drop their left-hand and even play rather quietly in their right hand so that you can hear the chords the harpist is comping.
It makes me think of Michael McKean as the harpist bandleader in Primetime Glick, where the audience nearly never hears any harp sounds:
Citation needed for the jazz harpist comping chords.
(No points for solo jazz harping-- only for jazz harping from inside the rhythm section.)