The post that was quoted here has been removedI agree in part. 'How are you today' has always seemed like an empty question, with the asker indeed having no genuine interest in your wellbeing. (This is perhaps a harsh generalized statement and more applicable to people serving you in coffee shops or stopping you in the street to get you to sign up to a particular charity etc.) But most times it is asked people are not expecting you to respond with a full inventory of your aches and pains. They are looking for a, 'fine thank you.'
However, I think this has changed somewhat during the era of Covid. Now when a person asks 'how are you today?' there is more likely to be a genuine interest in the answer, with us all having gone through similar experiences over the last year and a half.