I'm sure you realize that the intensive regimen they're talking about is primarily very low fat and low calorie, with a lot of exercise thrown in to work off any excess blood sugar before it can be stored as fat.

They're not going to tell them to eat a low carb diet, especially after losing the weight on a drug that doesn't really allow them to eat low carb, since about the only thing they can digest on that drug is carbs.

And of course a truly low carb diet has been relentlessly branded as unhealthy, "heart attack on a plate", and unsustainable. (now they also throw in the claim that it's killing the planet)

Add to that, a truly LC diet is something you can do on your own, without the $1,000+/month drug, and $200/month guidance (forever) on what specific foods and how much of each one to eat, along with how much to exercise to keep the weight off.

Instead, successful low carbers go to the store, buy enough meats, eggs, and dairy to last the week, plus some lower carb veggies (and maybe some nuts and lower carb fruits, possibly some canned/jarred olives or pickes). It's not terribly expensive, even once you add in some spices and herbs, or if you add in some SF syrups and protein powders for variety.

So a low carber's grocery cart looks mighty sparse compared to what's in most people's carts: multiple boxes of cereal, loaves of bread (don't forget the flat bread, pitas, and tortillas), cookies (need multiple kinds), crackers (multiple kinds), cans of soups and lots of different sauces, bottles of dressings and juices, multiple types of pastas, rice, quinoa, "nutrition bars", pretzels, donuts, chips, dips, mixes for cakes and puddings, packets of seasoning mixes, popsicles, ice cream, candies... the list goes on and on and on. Their cart is full, they'll be eating like it's a full time job, and be back next week to buy just as much all over again.

Even the ones who are doing (or have done) the GLP-1 drugs to lose weight are going to be buying all that stuff - they're still allowed to eat every single thing on that list, even if being told to limit how much they eat. (or in the case of those on the drugs, limited in how much they can eat without vomiting).