The Devil is the only one who will be tormented forever and ever (Revelation 20:10)
15 And whosoever was not found written in the book of life was cast into the lake of fire.
The others also go to the same place the devil does which is the lake of fire.
Not arguing the point you make because i don,t know, just pointing it out.
The doctrinal argument of those verses ends up being whether or not those thrown in the Lake of Fire with the Devil live forever and ever - but in never-ending torment.
My understanding is that everything not in the Book of Life is thrown into that fire, including death and hell itself. Only Satan still exists in torment forever - as Revelation 21 tells us that death and hell are swallowed up in victory and there are no more tears or suffering of any kind. God will make all things new in Christ - even new Heavens and a new Earth.
As to the Lake of Fire itself - even Peter refers to it dissolving and melting the heavens and the earth:
“But the day of the Lord will come as a thief in the night, in which the heavens will pass away with a great noise, and the elements will melt with fervent heat; both the earth and the works that are in it will be burned up. Therefore, since all these things will be dissolved, what manner of persons ought you to be in holy conduct and godliness, looking for and hastening the coming of the day of God, because of which the heavens will be dissolved, being on fire, and the elements will melt with fervent heat? Nevertheless we, according to His promise, look for new heavens and a new earth in which righteousness dwells. - II Peter 3:10-13
Not arguing the point you make because i don,t know, just pointing it out.
The translation of the verse depends upon your belief system. For example the King James, which you quoted:
(KJV) And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are,, and shall be tormented day and night for ever and ever.
If you look in the KJV you'll see "are" is in italics. This is to distinguish that the word is added by translators to make it more clear. It's not in the greek. And the next sentence doesn't give a "he" or "they" in who shall be tormented.
The Modern King James Version:
(MKJV) And the Devil who deceived them was cast into the Lake of Fire and Brimstone, where the beast and the false prophet were . And he will be tormented day and night forever and ever.
"Were" is added and the next sentence reflects that only the devil is in the lake of fire at this point..."he will be tormented".
The New King James:
(NKJV) The devil, who deceived them, was cast into the lake of fire and brimstone where the beast and the false prophet are. And they will be tormented day and night forever and ever.
Again "are" is added and this time "they" is used to reflect the belief of the translator.
So it's own these verse prove nothing linguistically, they only prove the translator bias.