It is his own pre-written. We will not call it plagiarism.

This statement is incorrect. When you copy from your former article and reposts it, it is also called plagiarism and it is as serious as when you copy another person's work..

Include a citation example to your post and put the remark below:
"I HAVE READ AND UNDERSTOOD THE STEEMIT ETIQUETTE ON STEEMIT COMMUNITY AND WILL DO MY BEST TI EMBRACE THEM"