Why...

So for starters requirements list say its compatible with iPhone 6 and the description says its compatible with the 6s and the SE and Im Puzzled as to why this is and when I try to run the app it says requires a device with at least 2 GB of RAM to run in my iPhone 6 only has one gigabyte of RAM epic games please make it compatible with the iPhone 5s and 6 please

AaronVey22 about Fortnite, v3.4.2