There was a time that we accepted all of these stories at face value, but one never knows, any more.
Several commenters at the DailyMail site said that there were past news stories of two individuals supposedly executed by Kim but who were later seen in public. It could also be the Russian fake news bots trying to mess up Trump's successful image caused by the NK talks before his sit-down with Putin coming up soon.
OTOH, if he did do this, I hope Trump will scold him and certainly not invite him to the WH any time soon.