A real compressed repack will expand back to the game's full size (around 12 GB) once fully installed. If the installed folder is only 4 GB, content has likely been stripped out.

Finding a version of Tomb Raider 2013 (often reduced to a fraction of its original size) is popular for several reasons:

Tomb Raider (2013) marked a defining moment for the iconic gaming franchise, providing a gritty, emotional reboot that redefined Lara Croft for a new generation. This cinematic action-adventure game tells the origin story of a young, inexperienced Lara who must survive on a treacherous, mythical island.