Pretty complex this one is.

Indeed, from what I have read, the original intent of this was more of getting people to try to incorporate various healthy habits into their lives; unfortunately, it has mutated into something that people use to claim that they can be healthy at whatever size they are (even though it is well known from all the medical literature out there, that being obese is usually not healthy over the long-term).

It had the potential to get people to adopt healthier practices; however, over time, thanks to the people who corrupted this beyond its original aims to justify not making the changes that are needed as per its original goals (i.e. that they are already healthy at their size they are at); the "new" meaning sort of stuck around, and has become the "de-facto" meaning of the phrase these days.

Kind of feel, the people who are practising it in its original state may probably want to "abandon ship" (i.e. this term), and maybe shift to using another that is less likely to be corrupted by people hoping to validate their unhealthy habits (i.e. same practice, different name). Either that, or fight against the people who had distorted the term to rationalise their unhealthy habits, and make it return to "orthodoxy" (i.e. return to its original goals).

To be honest, I actually feel that the original targets, as intended by the people behind this, could be able to help people who are currently overweight/obese to lose the excess weight (and end up with better health for themselves). Though, if anything, it has to be supplemented with actual "hard" targets being set (which I think, is something that the original is sort of lacking). People may practice certain habits in hopes of achieving some objective they may have in mind; however, if they are unable to quantify their progress, and if things remain the "status quo" (i.e. no change in weight), it is pretty much nothing but a waste of time and effort.

Just some thoughts... Apologies for the wall of text...