According to reports from another reliable insider, GTA 6 was originally supposed to include three cities, but two of them were cut (perhaps only temporarily).
Another set of interesting information has appeared online regarding Grand Theft Auto VI. According to them the scale of the project was to be heavily trimmed compared to the original plans.

Over the past few years there have been many rumors regarding GTA 6. Some of them mentioned three playable characters. So it's possible that Rockstar Games had too much ambitions at the beginning of development and then successively reduced the scale of the project, cutting out cities and characters, until finally it was left with one metropolis and a pair of protagonists.
The cut-out elements could be completed at a later date and added in some form to GTA 6 as part of the game's post-release development, just as Schreier suggests.
As a final reminder, according to the aforementioned recent reports Grand Theft Auto VI will launch in 2024 at the earliest.
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Author: Adrian Werner
A true veteran of the Gamepressure newsroom, writing continuously since 2009 and still not having enough. He caught the gaming bug thanks to playing on his friend's ZX Spectrum. Then he switched to his own Commodore 64, and after a short adventure with 16-bit consoles, he forever entrusted his heart to PC games. A fan of niche productions, especially adventure games, RPGs and games of the immersive sim genre, as well as a mod enthusiast. Apart from games, he devourers stories in every form - books, series, movies, and comics.