To be fair to Helen, her bastard ex wasn't mentioned once on the show - the only explicit narrative on screen was that she was a lone mum of three small kids which was tough, and her parents were giving her a lot of support. There was an ongoing "Helen regains her confidence" narrative, but if you didn't know better that could just be Louise Redknapp mark 2.
And I don't think she's given any interviews on the subject - we're all filling in the background on the basis of what her ex's new partner has posted on Instagram.
It's not like the various bereaved contestants who've told their stories directly to camera in VTs. But of course Helen's children will be watching every show, so it's entirely understandable that she would veto any producer suggestion that she should slag off their dad on air.