"Completely wrong" based on what? The conceptual definition of adolescent wellbeing is an area of robust debate involving a number of different interacting areas (e.g. physical, emotional, sociocultural, etc.)[1]. The markers of wellbeing that the study picked seem eminently reasonable as emblematic of several of these areas, although certainly not exhaustive.
[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7423586/