Anybody can lose weight or fat and as much as they want. All it takes is a caloric deficit and adhering to it long enough to reach your goal. I can find skinny people everywhere. What is rare is seeing big muscular people. Building actual lean tissue, not talking about getting fat, takes years and years of consistency. It is objectively an easier task to lose fat or weight than it is to build a big muscular physique.
There’s a reason gyms aren’t filled with guys with large amounts of muscle mass. Guys try for years to build as much muscle as possible, eating big, lifting heavy, pounding drugs only to spin their wheels or to get mediocre results. I can take anyone and get them damn lean in 6 months or less without question. What I need time for is building muscle mass.