The primary appeal of such a small file size is accessibility. For players with slow internet speeds or limited storage space, the promise of a full-scale wrestling simulator—complete with high-fidelity graphics and a massive roster—compressed into the size of a single music album is irresistible. In theory, this is achieved through "repacking," where unnecessary language files and high-resolution textures are stripped away. The Technical Reality
However, the leap from (a reduction of over 99%) is technically improbable for a functional modern game.
Frequently, "super-compressed" files found on third-party sites are not games at all. They often serve as "clickbait" to distribute malware, adware, or survey scams that exploit the user's hope for a free, easy download.