Many sites offering "Cydia Premium" IPAs are often "no-jailbreak" scam sites designed to trick users into downloading unwanted profiles or completing surveys. Technical Impossibility: A real Cydia app needs root access

If you want to install apps outside the official App Store without jailbreaking, use reputable sideloading

“Cydia Premium IPA” is not an official product. Instead, it is a colloquial term used to describe high-quality, pre-cracked or direct-install versions of paid Cydia tweaks repackaged as installable IPA files for non-jailbroken (or semi-jailbroken) devices.