How to delete Facebook for iPhone post off of public facebook profile?

I was tightening my Facebook security against unwanted public visitors and I noticed there's a post that states I've accessed my Facebook account from an iPhone device. This is true, but I do NOT want it there on my public profile! It is not on my timeline when I check, it is only visible to the public and I have no idea how to completely remove it. Also! I have tried to hide the date of my account creation by clicking the "hide from timeline" button but it won't remove itself off my timeline as well as stop random people from messaging me!

You can't hide both. Both of them are visible to public.