It does not follow; I will demonstrate this two ways:
There are two main camps for when the book of Revelation was written:
- Just before the destruction of the temple (AD 70), as argued by Edmundson here
- Just before the death of Emperor Domitian (AD 96), as suggested by Irenaeus in Against Heresies 5.30.3
Whether we opt for AD 70 or AD 96, the Bible as a compilation of 66/73 books did not yet exist at this time. The "book" being referred to in Revelation is the book of Revelation, not the Bible.
The books of the New Testament are not arranged chronologically. With minor exceptions, the epistles of Paul are organized by length. The Gospels are not arranged chronologically.
Revelation is at the end of the New Testament because it deals with the end-times, not because it was written last. The Gospel of John, 2-3 John, and possibly other New Testament documents, were likely completed after the book of Revelation. If that is true, John himself clearly shows he did not believe prophetic/scriptural utterances ceased with Revelation. A deeper dive on several of these chronological topics is available on my channel here and in Robinson's work here.
2. The Reductive Argument from Deuteronomy
The Torah records:
Ye shall not add unto the word which I command you, neither shall ye diminish ought from it, that ye may keep the commandments of the Lord your God which I command you. (Deut. 4:2)
This is found in the 5th book of the Bible. If Revelation refers to the entire Bible, or the entirety of God's prophetic revealed word, then applying the same reasoning to Deuteronomy that is used for Revelation would eliminate the last 61/68 books of the Bible!
(including Revelation, meaning the argument invalidates the very text it relies upon)
Notably, the Biblical texts very much frown upon those who argued for accepting revelation up to a certain point in the past and rejecting everything subsequent to it. For example, some groups argued for the Torah and the Torah alone as authoritative scripture; this view was rejected by Jesus and the apostles (i.e. consider how many times Isaiah, Jeremiah, and the Psalms are quoted in the New Testament).
Virtually no Jews or Christians today believe that Deut. 4:2 requires discarding everything found in the Bible after this pronouncement. When prohibiting the addition of commands or prophecy, the Torah speaks of itself, and Revelation speaks of itself. Neither speaks of the Bible or the entirety of God's message.
By Reductio Ad Absurdum and by self-refutation we can conclude that Revelation 22:18 does not indicate that there would be no further prophetic revelations after the book of Revelation.