Excellent point, but what needs to be pointed out is the next line in the Masters sentence: "Go forth and sin no more."
ditto
Jesus couldn't!
Under the LAW, 2 or 3 witnesses are required to CONDEMN.
HE had witnessed NOTHING, and no one else was owning up to seeing anything as well.
Thus the release with the admonition; "Go and sin no more."; indicating that HE did 'know' something about what had happened.