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The dev went missing, this isn't just leaving.

Crouch Jumping is an action performed in FPS games in which the player crouches mid-jump in order to hurdle an obstacle or reach higher ground.

Crouch jumping is especially prominent in the Half-Life series and other games running on Valve's game engines, as there it actually makes the player jump higher and reach places they wouldn't be able to reach with regular jumping. The mechanics of the crouch jump in such games are that when crouching, the player character does not actually hunch down lower, but instead pulls their feet up towards their body, allowing for greater clearance. A similar example comes from Tony Hawk's Pro Skater, in which the player could perform flip tricks while in mid air. Each trick, rather than pushing the board down, actually lifted the player higher above the board, allowing players to gain jump height through repeatedly tricking.

Crouch jumping initially was born as an elite skill for dedicated players, but came full circle in Mirror's Edge, the first-person free running game. Mirror's Edge allocated a specific button command for tucking the player's feet up against their body to allow for greater clearance while jumping.

Source: https://www.giantbomb.com/crouch-jump/3015-1492/

Like the idea but where's crouch jumping function? It's a requirement to most first person shooters etc