This site states this specific note directly: a gummy supplement is best viewed as one small addition to a wellness routine, not a replacement for a balanced diet, physical activity, sleep or professional medical care.
Rather than a vague "not a substitute for a healthy lifestyle" statement, this site names diet, activity, sleep and medical care specifically — worth reading each one individually rather than skimming the list as boilerplate.
This site's own FAQ separately answers "can a gummy replace healthy habits" with a similar list — worth reading both statements together as this site's consistently repeated boundary.