What people are missing here is that the medical approach to obesity/weight is not just people’s feelings being hurt - @dingaling has posted upthread about her godmother’s death being due to weight related misdiagnosis, and BMI continues to be a large part of how we view our health even though its usefulness has largely been debunked (one of my ATDs is doing a PhD in nutrition/obesity studies). Yeah weight can be and often is a factor in ill health, but fixating on it to the detriment of other factors can kill as well.
I don’t specifically have an issue with the campaign or raising awareness even though I don’t know how effective it will be (if you are obese then chances are you already know there are lots of increased health risks), but it is important to know that the NHS continues to promote BMI despite it being largely unhelpful, and for people to question why it keeps running with it in spite of this.