Answer
When deleting a Reddit account on mobile or in general, your post history will still be shown in reddit posts. When you make a post/comment it will stay on Reddit forever UNLESS you remove it manually.
How To Delete Reddit Account on Mobile | Delete Reddit Account on Mobile Easily!
How to Delete Reddit Account on Android/IOS!
Can I delete my Reddit account on mobile?
When deleting a Reddit account on mobile or in general, your post history will still be shown in reddit posts. When you make a post/comment it will stay on Reddit forever UNLESS you remove it manually.