Agreed. My fault for mis-stating. But I wonder how often this isn't clarified when conversations like this occur. For some people, "burn-in" and "image retention" might as well be the same in regards to how they feel about it, regardless of whether or not it's permanent. For others, perhaps they do feel more comfortable knowing "it won't ruin your investment."
I will also agree that I see the retention more observedly while in my Xbox Dash after watching Mixer and it does go away fairly quickly (eg under a few minutes if I'm staying in the Dash.)
All good. People unfortunately do use the terms "burn-in" when they really mean image retention. Just the way it is.
I've not read of anyone, under normal usage, having burn-in on a 2017 OLED. Heck, I don't know that I've read of anyone having burn-in, period, on a 2017 OLED. When you're selling this many OLEDs (especially in 2017 where the prices have finally become more reasonable), you're much more likely to read of burn-in issues, - and, well - I haven't read of these issues.