From my understanding no OLED screen has a warranty against burn in and PC use is a worst case scenario.
They likely have limited maximum power to the screen to mitigate.
Probably a lower limit on brightness than OLED TVs for HDR to reduce problems.
As long as you are happy with the warranty and max brightness with HDR (and price), go for it.
Its worth noting HDR on OLED TVs is already limited in quality by the use of white OLEDs to boost the brightness over 400nits, instead of full colour OLEDs.
This laptop will need to employ the same tactic unless a new more powerful/longer lived OLED is in production.
ie colours will not be as rich as they could be with HDR.
ps
According to this
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HDR can only be used for video not gaming.
Probably due to my above reasoning.
pps
One reason it is UHD not 1080p is probably because there are very few 1080p HDR panels.