Just going to point out the obvious in that you linked to LG to discuss OLED reliability, as if they aren't going to be obscenely biased.
Here's a link from an actual burn-in test that is still ongoing from a website that legitimately doesn't care which TV is the best, since they make money from any links used to buy TV's:
The problem with the site you listed is that they are only testing the LG B6 which is the 2016 model. They need to include the B7 2017 models. One of the reason I purchase the LG OLED is that it supports all HDR formats from HR10, HLG, Dolby Vision. This works out great since I watch a lot of Netflict content and they use Dolby Vision while other content providers use HR10. Once HLG takes over for HR10, the LG TV will support those as well. Not sure if HLG can be patched for TVs that do HR10 I am not sure. The way I see it, HDR adds more punch then 4K and its the real reason to upgrade to these high end TVs. I wanted to make sure that I was future proof unlike my previous 4K TV.