Is Zheng Weishi a calligrapher of Dahongpao?

No, Dahongpao is the collective name of two series of paintings published by People's Fine Arts Publishing House or Tianjin Ren Mei, namely "China Modern Famous Paintings Collection" and "China Contemporary Famous Paintings Collection". As of June 12, 2023, Zheng Weishi had not published similar books, nor was he a calligrapher of Dahongpao.