When people stop glp meds, like with other weight loss methods except surgery (and even then, regain is common), they'll usually regain the weight gradually. Only a few keep it off long-term, <5%. Most will return to near their starting weight. This has been shown in many papers.
I've seen that poor study before. It looks like research, but it's misleading. It says people are just as likely to lose more weight than regain after stopping semaglutide. That's wrong and goes against everything else published about glp meds.
The results might be real, but the data analysis is flawed. Maybe people who kept losing weight switched to tirzepatide. They present info that contradicts established understanding without explaining their findings, which shows it's not publishable in a peer-reviewed journal.
I believe people who want to maintain their weight loss on glp meds need to stay on them long-term. This is less true for people who are only a little overweight or haven't been overweight for long.
I strongly disagree with the doctor who wrote the article. Being unhappy with a therapy that stops working when you stop taking it is silly. Most medical treatments work that way, especially for hormonal/metabolic issues (except for a few surgical cures). The main reason people stop, besides nausea, is cost and unreliable insurance, which are political/economic issues, not a fault of the drug.