I wouldn't 100% rule this out..
The last steps I took were to replace my cable for a premium branded cable and also replaced the console.. when I replaced the cable I had my old console for 2 days and had no issues with flickering, also with the new console ive had no flickers at all...
Coincidence ? maybe maybe not..
If i get a chance tonight I'll revert back to one of the old cables and test if they cause a flicker