This is nonsense. In the first place, an election with multiple rounds is not the same as an election under AV. In particular, DD received 62 votes in the first ballot, but only 57 in the second ballot, whereas under AV he would have received at least as many votes in the second round as he had in the first round.

But more importantly, the voting between MPs only served to identify the two leading candidates to put to a vote of the wider party. In every round the two leading candidates were Cameron and Davis.