The headline is one specific framing of the research. The more obvious takeaway for me is that "married or cohabitating in own household" has dropped significantly while living with parents, living alone/single parents/roommates, living with other relatives/group living situations have all gone up. (The study doesn't seem to break out just living alone.)

So I'm not sure the degree to which I'm inclined to read this study as "young people moving in with parents" so much as "young people not moving in with partners."