Just because a deal is reached to get a movie made doesn't mean it'll actually get made. We've seen it happen a bunch of times with videogame adaptations, like Just Cause, which was announced in 2011 and Splinter Cell, which was in development way back in 2005. Neither film ever materialized.
Enter Metal Gear Solid. Hideo Kojima announced the film adaptation himself back in 2006, some 20 years ago now, and despite occasional names popping up—like that Viggo Mortenson or Hugh Jackman would play Snake, or that Paul Thomas Anderson or Jordan Vogt-Roberts would direct—the movie has never appeared or seemingly gotten past the pre-production phase.
