This has been abrogated. When Ahmad b. Hanbal was asked about a man taking a bath after his washing the dead, I heard him say: Ablution is sufficient for him.

Abu Dawud said: The narrator Abu Salih made a mention of the narrator Ishaq, the client of Za'idah between him and Abu Hurairah. He said: The tradition of Mus'ab is weak. It contains many things that are not practised.
Sunan Abi Dawud Book 21, Hadith 74