Can playerprefs stored on a mobile (Andoird/ iOS) be hacked remotely?

So I am developing an app that stores some user information. It was initially stored on the server but I wanted to add an extra security layer and store half of the information on the server and the other half on the phone just in case the server gets hacked or the APIs gets intercepted. Either data is unusable on its own. You would need both sets of data for it to be usable. I am saving user information in PlayerPrefs using Secured PlayerPrefs plugin from the Asset store.

I don't care if this data gets accessed by the user since it will be displayed in the App anyway but I was wondering is it possible for a hacker to remotely hack PlayerPrefs? How difficult would that be?