The word "New" is critical. Apple regularly revokes enterprise certificates used to sideload these apps. An IPA from last week might already be dead. A "new" IPA means someone, somewhere, just repackaged and resigned the game using a loophole, a developer account, or a service like AltStore or SideStore.
Chinese servers offer a localized version that requires a Chinese App Store account but provides authentic CS-style gameplay. cs 16 ipa new
Experiencing the classic mechanics on a handheld device. The word "New" is critical