Well, to be honest it IS an OLED still, meaning that the risk of burn-in is there. Samsung claims that it's really difficult to cause burn-in to a QD-OLED screen, as there's a number of counter-measures both in software and the display itself. One would have to really abuse a QD-OLED TV in order to have a burn-in issue with it.

On the other hand, that's true for OLED TVs too nowadays. They too feature tech, in hardware and software, that is designed to protect the panel from serious harm. I can personally attest to that. I have been working on OLED TVs as my daily drivers for work for more than six years now and I had no burn-in problems (although I do "babysit" those screens if proper use is "babysitting").

The simple truth, though, is that we just can't tell for sure yet because QD-OLED TVs have not been out for long enough to be tested e.g. in the course of a year or 18 months. Samsung is so certain of its tech that it's selling its QD-OLED PC monitors with a five-year guarantee. Make of that what you will. :-)