Hi, I believe if your machine has ghosting issue, it would also flicker like mine. My machine started flickering first then after awhile the ghosting problem also appeared. So you can try using some PC stress test applications like "Intel XTU" to keep your machine busy and heated for about an hour. Once the problems show up, run wmic csproduct command with elevated command prompt, take photos and videos with your mobile phone and send them to MS support.
My suggestion is that you can tell the support guy your machine has BOTHissues, just the ghosting happens more often. If they still reject your case. Tell them that according to the flickergate website, screen ghosting is one of the symptoms caused by the hardware defect so it must be included in this replacement program.
Good luck.