The Stearman belongs to TCT.
Why should he lie about that? What does he gain? Absent other proof, I would be inclined to believe him
The only trouble with that is the registration details and the accident report say the aircraft belongs to Ewald's company 3G, not to TCT, TCT is listed on the accident report as the operator on behalf of "Birdinabiplane". The aircraft does not belong to TCT despite what Ewald might proffer.
He says the TCT did all the flying using conventional navigation techniques e.g following roads etc.
How do we know she didn't?
Well, we know that's not fact, why else the high capability GPS systems in both cockpits? You suggesting they just had them in order to adjust the CoG.
All of that suggests that there really is no story here, and that Ms Curtis-Taylor has nothing to hide and that there is nothing for which she needs to apologise.
Sorry, the whole episode has been a scam. TCT lied about the "solo", and is shown by the subterfuge of the Farnborough departure giving the impression she was doing the flight "solo", along with her post Africa flight claiming she was "solo". There is just too much evidence that they can not, nor will not, explain.
Given the above: why is she so reticent, I wonder???
For the simple fact that she would have to admit publicly that it was all a scam and a pack of lies, and evidence shows it.