Despite what the article header here says, if I’m reading the editorial and summary of the studies correctly, they DO NOT suggest that supplements (not specifically multivitamins) do not help your health. They suggest that supplements do not prevent or reduce the risk of specific diseases or medical conditions; to wit, taking a vitamin supplement will not affect your chance of a heart attack or cancer.
That’s a direct refutation of quack claims made by some manufacturers, to be sure. But interpreting that data with the broad statement that they have no value and do not help your health is a bit of a reach. They can be useful to people who for whatever reason are not regularly getting their recommended daily doses of specific vitamins. Vitamins D and C being big ones, afaik, though I’m sure there are others. Do we require all of these vitamins all the time? Likely we don’t need them most of the time, if at all. But there is a value there…for continuing regular health to address nutritional deficiencies, just not as a magic bullet to cure cancer or counteract bad habits that lead to diseases or physical defects.