Ironically while the King of Tyre(which is the title given to it's deity Melqart) not to be mistaken for the Prince of Tyre(the human ruler) is called a fallen Cherubim who got cast out from the Garden of Eden due to Pride and judging from the Apocryphal book of Enoch(which has been quoted by Jude) it was refering to the fallen Cherubim Shamsiel who was one of the angels gaurding Eden after man was kicked out not Satan.
The other "evidence" for Satan's Smug Snake status comes from a description of Nebuchadnezzar(who was a Smug Snake) so Satan holding a Smug Snake status is unsupported in the actual Bible which implies he is willing to hand over his throne to the Beast of the Apocalypse out of fear of his power.
And let's not forget the Garden of Eden, where a literal Smug Snake tempted Adam and Eve to eat the forbidden fruit, only to be cursed by God as a punishment. Indeed, some versions say that the snake exists in the first place because God punished the original for his arrogance by taking his limbs and ability to speak and forcing him to spend the rest of eternity crawling on his belly.
The Apocrypha(namely the same book of Enoch quoted by the epistle of Jude) describes the sole fallen Archangel Ramiel as the realSmug Snake of the fallen Angels and being the king of Pride. He gets bonus points for being an actual snake(hinted to be the Leviathan itself).
Another fallen Angel who was a Smug Snake was Azazel the Goat demon who revealed the secrets of fashion to humans and later wound up being chained to a rock bound until the End Times where he'd be thrown into the Lake of Fire due to his lack of subtlety in his arrogance towards the Almighty even after losing.