Yeah, I don't buy that it just meant the first Marvel-produced live-action show, because it mentions "the company's 74-year history," which means it's referring to Marvel Comics, the publisher, rather than Marvel Studios, the film/TV production company which was founded only 20 years ago. Maybe someone mentioned to the article writer that it was Marvel Studios' first live-action series and the writer misinterpreted it to mean the first Marvel-based live-action series ever made.
Besides, even if that were what they meant, it would still be the second live-action TV series produced by Marvel (not counting pilots), with Blade: The Series
being the first. Or rather, the second live-action series adaptation of a Marvel comic and the third live-action series overall, since Mutant X
was also a Marvel Studios production.