Here
风流 means talented and distinguished, the sense in
苏轼's
千古风流人物 "the great men of a thousand ages" and
毛泽东's
数风流人物,
还看今朝 "for truly great men, look to the present". Said of someone's private life,
风流 means amorous, so
他是个风流人物 can also be a knowing hint.