Can Revelation 21:8 be an interpolation? [closed]

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ὁ νικῶν κληρονομήσει τὰ πάντα, καὶ ἔσομαι αὐτῷ Θεός, καὶ αὐτὸς ἔσται
μοι ὁ υἱός.

δειλοῖς δὲ καὶ ἀπίστοις καὶ ἐβδελυγμένοις καὶ φονεῦσι καὶ πόρνοις καὶ
φαρμακεῦσι καὶ εἰδωλολάτραις, καὶ πᾶσι τοῖς ψευδέσι, τὸ μέρος αὐτῶν ἐν
τῇ λίμνῃ τῇ καιομένῃ ἐν πυρὶ καὶ θείῳ, ὅ ἐστι δεύτερος θάνατος.

“He who overcomes shall inherit all things, and I will be his God and
he shall be My son.

“But the cowardly, unbelieving, abominable, murderers, sexually
immoral, sorcerers, idolaters, and all liars shall have their part in
the lake which burns with fire and brimstone, which is the second
death.”

— Revelation 21:7,8 (NKJV)

When I read the original text this verse seems off.

I noticed that this verse in Codex Sinaiticus has some mistakes (see the transcription below).

The concept of the "second death", whatever anyone thinks it is, and the image of the "lake of fire" are introduced in Revealation 20:14.

Edited:
This is from Rev. 20:12-14, where we find the concept of ‘second death’ and the image of the ‘lake of fire’

καὶ εἶδον τοὺς νεκρούς, μικροὺς καὶ μεγάλους, ἑστῶτας ἐνώπιον τοῦ
Θεοῦ, καὶ βιβλία ἠνεῴχθησαν· καὶ βιβλίον ἄλλο ἠνεῴχθη, ὅ ἐστι τῆς ζωῆς
καὶ ἐκρίθησαν οἱ νεκροὶ ἐκ τῶν γεγραμμένων ἐν τοῖς βιβλίοις, κατὰ τὰ
ἔργα αὐτῶν. καὶ ἔδωκεν ἡ θάλασσα τοὺς ἐν αὐτῇ νεκρούς, καὶ ὁ
θάνατος καὶ ὁ ᾅδης ἔδωκαν τοὺς ἐν αὐτοῖς νεκρούς· καὶ ἐκρίθησαν
ἕκαστος κατὰ τὰ ἔργα αὐτῶν. καὶ ὁ θάνατος καὶ ὁ ᾅδης ἐβλήθησαν εἰς
τὴν λίμνην τοῦ πυρός· οὗτός ἐστιν ὁ δεύτερος θάνατος

And I saw the dead, small and great, standing before [c]God, and
books were opened. And another book was opened, which is the Book of
Life. And the dead were judged according to their works, by the things which were written in the books.
The sea gave up the dead who were in it, and Death and Hades delivered
up the dead who were in them. And they were judged, each one according
to his works. Then Death and Hades were cast into the lake of fire.
This is the second death. (NKJV)

The transcription of Codex Sinaiticus:

τοιϲ δε ωϲ διλοιϲ και απιϲτοιϲ και εβδελυγμενοιϲ και π
φονευϲει κ(αι) πορνοιϲ και φαρμακοιϲ ˙ και ιδωλολατραιϲ και παϲιν
τοιϲ ψευδεϲιν το μεροϲ αυτων εν τη λιμνη τη καιομενη πυρι και θιω ο
εϲτιν ο θανατοϲ ο δευτεροϲ