He has put the time of her sighting back by over half an hour. It is he who is choosing not to believe a witness.
Heri does
not refute what the witness has said any more than Scotland Yard did ... had you read further you would have been able to follow his reasoning on the vagaries of memory and on why Jane may have got her times wrong.
I recommend reading it as it is interesting in whatever context ... but I suggest that you withdraw the statement that he " is choosing not to believe a witness " ... because you have got that entirely wrong.
**snip
Jane Tanner was in a similar context twice in half an hour: she went from Tapas Bar to Block 5 at 21:15 and at 21:45 that day.
I think she saw Gerry and Jez at 21:15, but she saw the abductor with Madeleine at 21:45.After the processes of attention, perception, storing in memory, redefinition of the importance of the sighting a posteriori, discussion with her friends, and recalling memories,
she mistakenly reports the two situations in a similar context as occurring both at 21:15.http://espacioexterior.blogspot.co.uk/2013/04/the-madeleine-mccann-abduction-janosch.html