Downloading "super compressed" games from unverified websites poses several risks:
Short checklist for quick triage of a “highly compressed PS3 ISO” listing Ps3 Iso Games Highly Compressed
While almost any game can be compressed, these popular titles are the most sought-after in "repack" circles: Ps3 Iso Games Highly Compressed
Standard tools (7-Zip, WinRAR, ZStd) applied to PS3 ISOs typically yield because the data is already packed. A 20 GB ISO compresses to ~17–19 GB – not “highly compressed.” Ps3 Iso Games Highly Compressed