No, The Emperor has already entered.
Zheng Congyuan pushed open the door himself; he naturally knew that the people at Zheng Nianru's side were of little use, especially at critical times. Thus, in urgent moments, there wasn't even anyone to make decisions.
However, this was inevitable. First, Empress Dowager Yan Ping naturally wouldn't allow someone like that by Zheng Nianru's side. Otherwise, she would have died several times over. Furthermore, it was his negligence. He knew it all along, yet for his own selfish reasons, he never entertained the thought of changing the personnel. Even if he had added just a couple of more astute people by her side, it wouldn't have come to today's situation.
