"indisputable fact"
When it doesn't say ANYTHING like that? John was invited to witness a scene in heaven, not the whole church.
We would't need a Revelation of Jesus Christ that's 20 chapters long if the Church was to leave in chapter 4.
He may have been speaking in reference to "the 24 elders" who are shown sitting on "24 thrones" with "stephanon/crowns of gold" and are saying "and hath redeemed US" (per the manuscript evidence for Rev5:9)… and this, following a "searching judgment" as indicated by the "was found" wording of 5:4 (like is used re: Paul at his arrest/trials in the latter parts of Acts [before/facing their (human) bema seat])… I made a post on that awhile back.
Take a listen (re: Rev5:9's wording):
[quoting that post]
Dr David Hocking showed Marv Rosenthal (I believe it was) about the manuscript evidence (re: Rev5:9-10; with v.9 saying "US" ['having redeemed US']) had to acknowledge "agreement" [that David Hocking was right and Scripture does say that, per the manuscript evidence Hocking pointed out], but then Rosenthal proceeded to publish his already-written "pre-wrath book" anyway, despite being informed of these facts:
[see @ this vid (approx 9-min vid total) :
--note also in this video that he mentions something Geo E. Ladd [...] had said about this passage/esp verse 9]
[end quoting that post]