Most manufacturers only list average power draw, but in HDR mode you can get much higher peak power useage.

This website also lists peak power draw for many TVs, in this example the Bravia 9 85 inch has a peak of 380W

https://www.displayspecifications.com/en/model-power-consumption/fca71198

Your research would be incorrect

Gigantic 80" screens generally draw something like 120W

In HDR mode they can draw a lot more than that for short peaks