It could be a bias, that's why we do blinded comparisons for a more accurate rating. If we have to consider my opinion, since I use it often, then no, it hasn't gotten worse over time.
Well I can't load that website so I can't assess their methodology. But I am telling you it is objectively worse for me now. Many others report the same.
Edit - the website finally loaded for me and while their methodology is listed, the actual prompts they use are not. The only example prompt is "correct grammar: I are happy". Which doesn't do anything at all to assess what we're talking about, which is ChatGPT's inability to deal with subjects which are "risky" (where "risky" is defined as "Americans think it's icky to talk about").
