Shang Qinghua does not know anyone called Shen Yuan. He does know a Shen Qingqiu, and the tone of the surname is right, so either that's a coincidence or Cucumber-bro picked the most obvious secret disguise name of all time. But his strategy of "everyone likes Cucumber-bro" has served him well so far, so if it is him, that's an enthusiastic yes! "Are you speaking of a tall man"—he gestures—"who wears light green robes and carries a folding fan?"