No, the defence hasn't changed their mind.
Dr Dimitrova, who was interviewed for the C4 documentary, says that the account she and Dr Aiton wrote is perfectly compatible with the international expert panel's. The international expert panel said that the perforation of the abdomen may have led exacerbated the issue.
So the sequence of events is:
Event 1
Subcapsular liver hematoma forms, can be before or at birth, can be following difficult birth which international expert panel has stated may have been the case. We don't know Aiton and Dimitrova's suggestions on how it formed.
Event 2
Bleeding from liver hematoma on day 3 of the infant's life. Liver then ruptures either as a result of build up of blood from hematoma or as a result of perforation of liver via abdomen in medical mishap. The two aren't mutually exclusive.
Liz Hull (as well as the presenters of the BBC documentary) have caused enormous confusion and greatly exaggerated the differences in what we know of the two events by conflating events 1 and 2.