WTF have I just read?
How in the anyone's world did this ever receive ethics clearance? Universities can't pretend to be unaware of how serious a potential ethics breach is, particularly one of this gravity. So a few possibilities exist: the ethics (standard requirement for all PhD research) were submitted on a disingenuous basis, approved and then not revised as the research progressed, or were approved in the form the research took (I'd genuinely like to know how) or have somehow slipped through the net, which given the methods of data storage and PhD upgrade approval, shouldn't even be possible.
As for the supervisors' research profile ...
I don't know what the hell our HE system has become. As an academic who was once passionate and committed to my subject and students, I've questioned for a while how I feel about being party to a morally corrupt system that now rewards mediocrity and kissing the right backsides, discourages critical thinking, and in which bullying, discrimination (and worse) is rife, despite the universities' constant, hypocritical virtue signalling. Even the union is as bad. I've lost faith in the sector completely and I know I'm not the only one reconsidering my future.