Not a dubious claim
See here in the powerpoint presentations, scroll down
http://www.mccannpjfiles.co.uk/PJ/POWERPOINT.htm
At least the words have been attributed to Jane Tanner, whether she said that or someone claims she said that from within Team Mccann, who knows
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After seeing the sketches produced by Melissa Little with Gail Cooper, Jane Tanner believes that there is an 80% likelihood that this is the same man she saw carrying away the child believed to be Madeleine''
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That statement refers to ''sketches'' (plural) not just one picture of a man's face. Those two witnesses would have given descriptions of the entire man, not just his face. I've always thought that the 20 percent that Jane could not corroberrate was his face.
She also says that although she was happy with the picture of a man carrying a child which had been produced, she was not happy with his face, and so it was blanked out. That would concur with her rogatory statement in which she says she didn't see his face, only a side view of him.