This just sounds like hyperbole a bit. Linus recently did a video with the G2 versus the s95b (s95b is wayyy better than the Alienware in terms of sustained brightness) they looked very close. The difference between the s95b and G2 is much more significant on paper than the difference between the Alienware and the LG C2.You guys must be doing something wrong. When I put my PG32 next to my LG OLED, the PG32 wrecked it in color volume/saturation. LG OLEDs have pretty mediocre colors honestly (as the test data shows) and one reason why I got rid of it.
I'm not saying the color volume wouldn't be noticeable, but there definitely is some unusual dimming behavior on the Alienware. Rtings rated the alienwares "Real scene brightness" at around the same nit peak as its 400 true black setting. In you average HDR scene the C2 is potentially brighter. Color volume not withstanding.