There it was. The Internet Archive had a clean, redump.org-verified ISO of the original game disc. It wasn't a cracked, repacked, or suspicious OBB-only file. It was the genuine, unaltered source.
The proper text you're looking for seems to relate to avoiding malware and ensuring game integrity:
For a safe experience, use platforms that provide security scan reports: : Offers a verified PES 2011 APK (v1.0.6)