That's according to wccftech, who in turn got it from Polish outlet Parkiet. Crucially, CDPR means in terms of dollars invested, not the scope of the content. Considering Phantom Liberty will be putting Idris Elba on the payroll (not to mention reprising Keanu Reeves), it perhaps shouldn't come as a surprise that this endeavour would end up costing a pretty penny.
The Witcher 3's Blood & Wine is likely the previous record holder for budget allowance, introducing a 20+ hour storyline, the picturesque region of Toussaint and all its accompanying quests and encounters, not to mention the Mutation system, which did so much to refresh the game's core combat mechanics.
Still, CDPR was quick to clamp down on fan enthusiasm regarding the scope of the content, with global PR director Radek Grabowski reiterating on both Reddit and Twitter that "biggest" means budget, not scope, which isn't necessarily the same thing. We would imagine the Polish company is quite wary of overhyping anything related to Cyberpunk 2077 for very obvious reasons.
We don't have anything more specific than just "2023" in terms of a release window, but colour us intrigued. After all, everyone loves a good redemption story. Are you excited by the big bouncing budget on Phantom Liberty? Keep your expectations in check in the comments section below.