The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
Thou
Here (Eze 28:12-15), as in (Isa 14:12) the language goes beyond the king of Tyre to Satan, inspirer and unseen ruler of all such pomp and pride as that of Tyre. Instances of thus indirectly addressing Satan are: (Gen 3:14); (Gen 3:15); (Mat 16:23). The unfallen state of Satan is here described; his fall in (Isa 14:12-14).
(See Scofield) - (Rev 20:10).
But there is more. The vision is not of Satan in his own person, but of Satan fulfilling himself in and through an earthly king who arrogates to himself divine honours, so that the prince of Tyrus foreshadows the Beast. (Dan 7:8); (Rev 19:20).