Cydia Ipa File Verified Here

A file that tells iOS the app is "signed" and allowed to run. How IPA Files and Cydia Interact

There are services (often called "stores") that sign IPAs using enterprise certificates, allowing you to install them directly from Safari. cydia ipa file

So, while a "Cydia IPA" doesn’t directly give you Cydia, a jailbreak IPA does. A file that tells iOS the app is "signed" and allowed to run