despite the mandatory inclusiveness training courses, people who held certain views still held them, they simply chose the expected (and obviously expected) answers from the quiz at the end of the training module. I'm not at all sure that this works, regardless of the supposed good intentions.
The MOD's current online D&I training package makes clear that it's permitted to hold prejudiced views, just not to take prejudiced actions or decisions. There has to be such a clause in policy to avoid effectively proscribing certain religious beliefs, but equally it means that what you describe is OK. When advocacy of D&I strays into 'thought police' territory, willingness to listen (and therefore effectiveness) is more likely to fall away.