Excellent answer. Further, אֲדֹנָי (Adonai) never refers to men and never refers to angels either. The NT is full of allusions to this wonderful Psalm such as Heb 1;13, 8:1, 10:12, 12:2, Mark 12:36, matt 22:44, Acts 2:34, Luke 20:42, all of which attribute this Psalm to a conversation between YHWH and Jesus Christ, as also YHWH. — Dottard 1 hour ago