Maybe, this remark could make me think of one (secular) humanist, A. C. Grayling, and the way he speaks, examples are videos like “A.C. Grayling on making the most of this life”, “A.C. Grayling: what makes a great life?”
Grayling belongs both to a secular humanist association, the “National Secular Society”, and a religious humanist association “Humanists UK”. He was academically trained by a logical positivist (so Enlightenment culture). This explaining maybe that.
This “mix” is not rare at all in Anglo-Saxon humanist culture.
Could you indicate what precisely makes you fell that secular humanism was about vague ideas, e.g. be nice to others, live life to the fullest?