Enough with all of this nonsense.
Procreate IS compatible with an iPad Mini 4.
Period.
While an iPad Mini 4 is NOT compatible with ANY Apple Pencils, Procreate is still compatible with that iPad Mini 4 and you can either use your finger or a “non-bluetooth”, “dumb”, “purchase anywhere”, third party capactive stylus that simulates a finger touch.
Plenty of these “dumb” capacitive stylii to be found.
Also, so-called, powered. active, battery powered, non-bluetooth, fine point stylii that also work like a finger touch but are more precise, but still a “dumb” stylus.
All thr stylii mentioned have NO screen pressure sensitivity for light to dark/thin to thick lines NOR any hand palm rejection.
You do not necessarily need to have use of a compatible Apple Pencil to use the Procreate drawing app.
For palm rejection with “dumb” stylii, you would need to purchase and use special, non-body electrical conducting, lycra-based material drawing/writing glove that works by isolating your hand/palm and allow you to lay your hand/palm on the screen as you draw in these non-compatible Adonit stylus apps.
Something like these found on Amazon.
https://www.amazon.com/AKX-Rejection-Drawing-Graphic-Sketching/dp/B08R6PWKC9/ref=sr_1_33_sspa?dchild=1&keywords=tablet+drawing+gloves&qid=1611535160&sr=8-33-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExMFg5WFBZWFpCS1kmZW5jcnlwdGVkSWQ9QTA5OTA2MzMxRUVYUURUMlAwVU4wJmVuY3J5cHRlZEFkSWQ9QTAxNDY1NjMxVjg1NE45TVRXSUQ3JndpZGdldE5hbWU9c3BfYXRmX25leHQmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl
https://www.amazon.com/Timebetter-Rejection-Drawing-Sketching-Suitable/dp/B08DKGHYMS/ref=sr_1_21?dchild=1&keywords=drawing+gloves&qid=1611533128&sr=8-21
Many more makers of these types of gloves found on Amazon and in different hand sizes, as well!
Procreate IS compatible with an iPad Mini 4.
Best of Luck to You!