Its interesting to see how "whataboutism" almost wholly died in the internet. Everyone realised that it is a copout and mostly nonsensical retort.
I used to use whataboutism all the time and I don't see it anymore today.
Oh well if the Washington Post conducted a study then I guess that is that. Nevermind that the AI labs can't replicate those results and neither can I.
Did you try running any of those prompts yourself? I do not get the biased answers they reported, running them in an incognito window.