My own guess is that her suggestion is based on faulty material
Fisherman is so utterly entrenched in his own dogma, and so irrationally and undeservedly convinced of his rightness that he is prepared to accept that an expert who examined the documents personally must have been looking at "faulty" material. The sheer crassness of this suggestion is difficult to engage with, but it gets to the heart of people's obsessions. He tries to reduce the absurdity of the suggestion by reasuring us that it is just a "guess". Fair enough. It's an outrageous and outlandish guess.
Fisherman is basically coming up with the worst excuses conceivable for dismissing experts who go against his view, whilst bombrding other experts until they do "agree" with him, which speaks very poorly for both Fisherman and Leander.
But when an expert of Leanders caliber tells us that he would be surprised if it was NOT the same
The logical explanation behind Iremonger arriving at the opinion she did is that she is an expert in her field who examined the original documents. Leander urged caution that his views should not be construed as a "full expert opinion" because he was only looking at computer images.

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