Seems EW just mistakenly paraphrased some shyt. I dont see an actual quote of what Reeves said, just EW paraphrasing what Gunn said.
Also there is a script, just not a fully turned in one. Gunn said he hasnt seen a script but Reeves has turned in parts of a script to WB.
Where are you seeing that Batman 2 will be apart of Elseworlds? Only thing we saw was that rumor that Gunn wanted Pattinson to be his DCU batman. That can happen with Reeves stuff still being elseword and Gunn going a different route with Pattinson as batman.
Here's the EW article you are talking about. Not direct quote from Reeves on what Reeves said about confirming but there is a correction by the arthur with a direct quote from Reeves.
'The Batman' director Matt Reeves shares his plans for expanding his corner of the DC empire, from evolving scrapped spinoffs into HBO's 'The Penguin' and Robert Pattinson's next movie.
ew.com
See how they used direct quotes from Reeves about "finishing the script"? They dont use those when talking Reeves confirming the script is finished.