Have you looked at the menu recently? Bitcoin fixes this:
https://www.youtube.com/watch?v=6OasCaT2qTAI tracked this inflation from Twitter/X by simply searching for the keyword "Mcdouble costs". Having the data fed straight from primary sources is a much more revealing truth than any "official" graph the government puts out.
I agree with you in that part where you say that such data is usually a better indicator of inflation than the one that government tells us but how can Bitcoin fix that? If no one does the job, Bitcoin can't magically make anyone rich or fix the inflation. To be honest, if governments stop printing money out of thin air and invest in engineering, chemistry, biology and agriculture, we all will have an amazing quality of life. This is the key to success, the science but these times no one cares about that and they prioritize brainwashers and influence culture, like Youtubers, TikTokers and movie stars.